diff --git a/Exec/DoubleRamp/prob.H b/Exec/DoubleRamp/prob.H
index 48b5458..66ab0a0 100644
--- a/Exec/DoubleRamp/prob.H
+++ b/Exec/DoubleRamp/prob.H
@@ -6,7 +6,6 @@
 
 #include "IndexDefines.H"
 #include "prob_parm.H"
-#include "CAMR_params.H"
 #include "EOS.H"
 
 AMREX_GPU_DEVICE
diff --git a/Exec/MovingEBCases/MovingPlane_Shock/prob.H b/Exec/MovingEBCases/MovingPlane_Shock/prob.H
index 1f8850c..6b8f5b0 100644
--- a/Exec/MovingEBCases/MovingPlane_Shock/prob.H
+++ b/Exec/MovingEBCases/MovingPlane_Shock/prob.H
@@ -6,7 +6,6 @@
 
 #include "IndexDefines.H"
 #include "prob_parm.H"
-#include "CAMR_params.H"
 #include "EOS.H"
 
 AMREX_GPU_DEVICE
@@ -22,7 +21,6 @@ CAMR_initdata( int i, int j, int k,
     const amrex::Real*      dx = geomdata.CellSize();
 
     amrex::Real x = prob_lo[0] + (i+amrex::Real(0.5))*dx[0];
-    amrex::Real y = prob_lo[1] + (j+amrex::Real(0.5))*dx[1];
 
     amrex::Real Pt, rhot, uxt;
     if (x < amrex::Real(0.5)) {
diff --git a/Exec/ReReTest/prob.H b/Exec/ReReTest/prob.H
index 5b43e9e..b072d41 100644
--- a/Exec/ReReTest/prob.H
+++ b/Exec/ReReTest/prob.H
@@ -6,7 +6,6 @@
 
 #include "IndexDefines.H"
 #include "prob_parm.H"
-#include "CAMR_params.H"
 #include "EOS.H"
 
 AMREX_GPU_DEVICE
diff --git a/Exec/Sod/prob.H b/Exec/Sod/prob.H
index 891e706..ad5aade 100644
--- a/Exec/Sod/prob.H
+++ b/Exec/Sod/prob.H
@@ -6,7 +6,6 @@
 
 #include "IndexDefines.H"
 #include "prob_parm.H"
-#include "CAMR_params.H"
 #include "EOS.H"
 
 AMREX_GPU_DEVICE
diff --git a/Exec/SodPlusSphere/converging_nozzle.inp b/Exec/SodPlusSphere/converging_nozzle.inp
index a03b91f..08d0b30 100644
--- a/Exec/SodPlusSphere/converging_nozzle.inp
+++ b/Exec/SodPlusSphere/converging_nozzle.inp
@@ -1,3 +1,7 @@
+# This is a 3D problem: the converging-nozzle geometry is axisymmetric (built
+# with a lathe), so it must be run with an executable built with DIM = 3.
+# Note that the GNUmakefile in this directory defaults to DIM = 2.
+
 amrex.fpe_trap_invalid = 1
 amrex.fpe_trap_zero = 1
 amrex.fpe_trap_overflow = 1
diff --git a/Exec/SodPlusSphere/prob.H b/Exec/SodPlusSphere/prob.H
index db10561..9e4dc55 100644
--- a/Exec/SodPlusSphere/prob.H
+++ b/Exec/SodPlusSphere/prob.H
@@ -6,7 +6,6 @@
 
 #include "IndexDefines.H"
 #include "prob_parm.H"
-#include "CAMR_params.H"
 #include "EOS.H"
 
 AMREX_GPU_DEVICE
diff --git a/Source/CAMR.H b/Source/CAMR.H
index 47b3005..405aebc 100644
--- a/Source/CAMR.H
+++ b/Source/CAMR.H
@@ -479,29 +479,26 @@ CAMR::numGrow()
   int ng = 4;
 #ifdef AMREX_USE_EB
   // IF MOL     + FRD  then 5
-  // IF Godunov + FRD  then 6
+  // IF Godunov + FRD  then 7
   // IF MOL     + SRD  then 6
-  // IF Godunov + SRD  then 7
+  // IF Godunov + SRD  then 8
   // IF MOL     + none then 5
   // IF Godunov + none then 6
   //
-  // NoRedist takes the same ngrow_bx = 2 as FluxRedist in
-  //    construct_hydro_source, so it needs the same number of ghost cells
-  if (redistribution_type == "FluxRedist" || redistribution_type == "NoRedist")
+  // Godunov + redistribution needs one more than the PLM stencil: the traced
+  // states on the outer ring of the EB Godunov box feed the redistributed
+  // update, and flatten_eb() needs q at +-3 around that ring.
+  if (redistribution_type == "FluxRedist")
   {
-    if (do_mol) {
-        ng = 5;
-    } else {
-        ng = 6;
-    }
+    ng = (do_mol) ? 5 : 7;
+  }
+  else if (redistribution_type == "NoRedist")
+  {
+    ng = (do_mol) ? 5 : 6;
   }
   else if (redistribution_type == "StateRedist")
   {
-     if (do_mol) {
-        ng = 6;
-     } else {
-        ng = 7;
-     }
+    ng = (do_mol) ? 6 : 8;
   }
 #endif
   return ng;
diff --git a/Source/CAMR.cpp b/Source/CAMR.cpp
index c414ec2..6142a63 100644
--- a/Source/CAMR.cpp
+++ b/Source/CAMR.cpp
@@ -204,12 +204,13 @@ CAMR::read_params()
   }
 #endif
 
-  // for the moment, ppm_type = 0 does not support ppm_trace_sources --
-  // we need to add the momentum sources to the states (and not
-  // add it in trans_3d
-  if (ppm_type == 0 && ppm_trace_sources == 1) {
+  // Source tracing is not implemented for either reconstruction: the
+  // PPM source block in PPM.cpp is commented out and PLM never had one.
+  // Sources are added in hydro_transd/hydro_transdd instead.
+  if (ppm_trace_sources == 1) {
     amrex::Print()
-      << "WARNING: ppm_trace_sources = 1 not implemented for ppm_type = 0"
+      << "WARNING: ppm_trace_sources = 1 is not implemented (ppm_type = "
+      << ppm_type << "); sources are added in the transverse step instead"
       << std::endl;
     ppm_trace_sources = 0;
     pp.add("ppm_trace_sources", ppm_trace_sources);
diff --git a/Source/EB/eb_converging_nozzle.cpp b/Source/EB/eb_converging_nozzle.cpp
index 08e2ddf..445ab62 100644
--- a/Source/EB/eb_converging_nozzle.cpp
+++ b/Source/EB/eb_converging_nozzle.cpp
@@ -14,6 +14,13 @@ using namespace amrex;
  ********************************************************************************/
 void make_eb_converging_nozzle (const Geometry& geom, int required_coarsening_level)
 {
+#if (AMREX_SPACEDIM != 3)
+  // In 2D amrex's LatheIF revolves about the origin and RotationIF ignores the
+  // axis argument, so the same expression below builds an unrelated geometry
+  // rather than a nozzle.
+  amrex::ignore_unused(geom, required_coarsening_level);
+  amrex::Abort("CAMR.geometry = converging-nozzle is an axisymmetric (lathe) geometry and requires DIM = 3");
+#else
   amrex::Real d_inlet = 8;
   amrex::Real l_inlet = 24;
   amrex::Real l_nozzle = 5;
@@ -52,4 +59,5 @@ void make_eb_converging_nozzle (const Geometry& geom, int required_coarsening_le
   auto polys = amrex::EB2::makeUnion(main, nozzle_exit);
   auto gshop = amrex::EB2::makeShop(polys);
   EB2::Build(gshop, geom, required_coarsening_level, required_coarsening_level);
+#endif
 }
diff --git a/Source/Hydro/Hydro_utils_eb_K.H b/Source/Hydro/Hydro_utils_eb_K.H
index a1ccc77..ca15c16 100644
--- a/Source/Hydro/Hydro_utils_eb_K.H
+++ b/Source/Hydro/Hydro_utils_eb_K.H
@@ -545,11 +545,13 @@ void eb_compute_div (int i, int j, int k, int n,
     if (eb_weights_type == 0) {
         redistwgt(i,j,k) = 1.0;
     } else if (eb_weights_type == 1) {
-        redistwgt(i,j,k) = q(i,j,k,QRHO)*( q(i,j,k,QREINT) +
+        // Total energy density; note QREINT is rho*e in CAMR (CNS's QEINT
+        // is e, which is where the old rho*(...) form came from).
+        redistwgt(i,j,k) = q(i,j,k,QREINT) + 0.5*q(i,j,k,QRHO)*(
 #if (AMREX_SPACEDIM == 2)
-                        0.5*(q(i,j,k,QU)*q(i,j,k,QU) + q(i,j,k,QV)*q(i,j,k,QV)) );
+                        q(i,j,k,QU)*q(i,j,k,QU) + q(i,j,k,QV)*q(i,j,k,QV) );
 #else
-                    0.5*(q(i,j,k,QU)*q(i,j,k,QU) + q(i,j,k,QV)*q(i,j,k,QV) + q(i,j,k,QW)*q(i,j,k,QW)) );
+                        q(i,j,k,QU)*q(i,j,k,QU) + q(i,j,k,QV)*q(i,j,k,QV) + q(i,j,k,QW)*q(i,j,k,QW) );
 #endif
     }
     else if (eb_weights_type == 2) {
diff --git a/Source/Hydro/MOL/MOL_umeth_eb.cpp b/Source/Hydro/MOL/MOL_umeth_eb.cpp
index 08906ab..e7e7ccf 100644
--- a/Source/Hydro/MOL/MOL_umeth_eb.cpp
+++ b/Source/Hydro/MOL/MOL_umeth_eb.cpp
@@ -65,8 +65,9 @@ MOL_umeth_eb (const Box& bx_to_fill,
     // ****************************************************************
     // Slopes -- we will compute divc on bxg2 so need slopes on bxg3
     // ****************************************************************
-    FArrayBox slopetmp;
-    slopetmp.resize(bxg_ii,QVAR);
+    // Async arena: the Riemann kernels that read the slopes are still in
+    // flight when this function returns and nothing here synchronizes.
+    FArrayBox slopetmp(bxg_ii, QVAR, amrex::The_Async_Arena());
     auto const& slope = slopetmp.array();
 
     AMREX_D_TERM(auto const& fx_arr = flux_tmp[0];,
diff --git a/Source/Params/_cpp_parameters b/Source/Params/_cpp_parameters
index f2e1ea3..60706f4 100644
--- a/Source/Params/_cpp_parameters
+++ b/Source/Params/_cpp_parameters
@@ -60,8 +60,10 @@ const_grav                   Real           0.0
 # 2: extrema-preserving ppm (deprecated in C++)
 ppm_type                     int           0
 
-# to we reconstruct and trace under the parabolas of the source
-# terms to the velocity
+# do we reconstruct and trace under the parabolas of the source
+# terms to the velocity.  Not implemented for any ppm_type: the source
+# tracing in PPM.cpp is commented out and the sources are added in the
+# transverse step instead, so setting this to 1 warns and resets it to 0.
 ppm_trace_sources            int           0
 
 # for piecewise linear, reconstruction order to use
@@ -104,6 +106,8 @@ transverse_reset_density     int           1
 #-----------------------------------------------------------------------------
 # category: EB
 #-----------------------------------------------------------------------------
+# weights used to distribute the small-cell correction in flux redistribution:
+# 0: uniform; 1: total energy density; 2: density; 3: volume fraction
 eb_weights_type              int          2
 redistribution_type          string       "FluxRedist"
 
diff --git a/Source/Params/parse_CAMR_params.py b/Source/Params/parse_CAMR_params.py
index 79abca9..41f61fb 100755
--- a/Source/Params/parse_CAMR_params.py
+++ b/Source/Params/parse_CAMR_params.py
@@ -157,9 +157,12 @@ def get_decl_string(self):
         # this is the line that goes into CAMR_params.H included
         # into CAMR.H
 
-        static = ""
+        # prob.H includes this header at file scope, so the declarations are
+        # also unused file-scope statics in several translation units; the
+        # attribute keeps -Wall -Werror builds quiet.
+        static = "[[maybe_unused]]"
         if self.static:
-            static = "static"
+            static = "[[maybe_unused]] static"
 
         if self.dtype == "int":
             tstr = "{} int {};\n".format(static, self.cpp_var_name)