diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 81c9b568b..78847c173 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -7,19 +7,20 @@ This file contains a high-level description of this package's evolution. Release
 
 ## 4.9.3 - TBD
 
+* Fix a race condition in some ncdump tests. See [Github #2682](https://github.com/Unidata/netcdf-c/pull/2682).
+* Fix a minor bug in reporting the use of szip. See [Github #2679](https://github.com/Unidata/netcdf-c/pull/2679).
+* Simplify the handling of XGetopt. See [Github #2678](https://github.com/Unidata/netcdf-c/pull/2678).
 * Improve performance and testing of the new nc_reclaim/copy functions. See [Github #2699](https://github.com/Unidata/netcdf-c/pull/2699).
 * [Bug Fix] Provide a partial fix to the libcurl certificates problem. See [Github #2690](https://github.com/Unidata/netcdf-c/pull/2690).
 * Improve S3 documentation, testing, and support See [Github #2686](https://github.com/Unidata/netcdf-c/pull/2686).
 * Remove obsolete code. See [Github #2680](https://github.com/Unidata/netcdf-c/pull/2680).
 * [Bug Fix] Add a crude test to see if an NCZarr path looks like a valid NCZarr/Zarr file. See [Github #2658](https://github.com/Unidata/netcdf-c/pull/2658).
+* Fix 'make distcheck' error in run_interop.sh. See [Github #2631](https://github.com/Unidata/netcdf-c/pull/2631).
 
 ## 4.9.2 - March 14, 2023
 
 This is the maintenance release which adds support for HDF5 version 1.14.0, in addition to a handful of other changes and bugfixes.  
 
-* Fix 'make distcheck' error in run_interop.sh. See [Github #2631](https://github.com/Unidata/netcdf-c/pull/2631).
-* Fix a minor bug in reporting the use of szip. See [Github #2679](https://github.com/Unidata/netcdf-c/pull/2679).
-* Simplify the handling of XGetopt. See [Github #2678](https://github.com/Unidata/netcdf-c/pull/2678).
 * Update `nc-config` to remove inclusion from automatically-detected `nf-config` and `ncxx-config` files, as the wrong files could be included in the output.  This is in support of [GitHub #2274](https://github.com/Unidata/netcdf-c/issues/2274).
 * Update H5FDhttp.[ch] to work with HDF5 version 1.13.2 and later. See [Github #2635](https://github.com/Unidata/netcdf-c/pull/2635).
 * [Bug Fix] Update DAP code to enable CURLOPT_ACCEPT_ENCODING by default. See [Github #2630](https://github.com/Unidata/netcdf-c/pull/2630).
diff --git a/ncdump/test_ncdump.sh b/ncdump/test_ncdump.sh
index 170daf509..71785f596 100644
--- a/ncdump/test_ncdump.sh
+++ b/ncdump/test_ncdump.sh
@@ -82,4 +82,16 @@ ${execdir}/tst_fillbug
 ${NCDUMP} tst_fillbug.nc > tst_fillbug.cdl
 # echo "*** comparing tst_fillbug.cdl with ref_tst_fillbug.cdl..."
 diff -b tst_fillbug.cdl $srcdir/ref_tst_fillbug.cdl
+
+
 }
+
+NCDUMPPATH=${builddir}
+if test "x$NCDUMPDIR" != x ; then
+  NCDUMPPATH="${NCDUMPPATH}/$NCDUMPDIR"
+  rm -fr $NCDUMPPATH
+  mkdir $NCDUMPPATH
+fi
+find $NCDUMPPATH
+
+
diff --git a/ncdump/tst_nccopy4.sh b/ncdump/tst_nccopy4.sh
index baaa0e614..73ff138fa 100755
--- a/ncdump/tst_nccopy4.sh
+++ b/ncdump/tst_nccopy4.sh
@@ -4,12 +4,13 @@ if test "x$srcdir" = x ; then srcdir=`pwd`; fi
 . ../test_common.sh
 
 
+
+NCDUMPDIR="testdir_ncdump_nccopy4"
 . $srcdir/test_ncdump.sh
 
-isolate "testdir_ncdump_nccopy4"
-
 # Move into test directory
-cd $ISOPATH
+cd $NCDUMPPATH
+
 
 set -e
 
diff --git a/ncdump/tst_netcdf4.sh b/ncdump/tst_netcdf4.sh
index d87865654..630344a94 100755
--- a/ncdump/tst_netcdf4.sh
+++ b/ncdump/tst_netcdf4.sh
@@ -5,12 +5,13 @@
 if test "x$srcdir" = x ; then srcdir=`pwd`; fi
 . ../test_common.sh
 
+
+NCDUMPDIR="testdir_ncdump_netcdf4"
 . $srcdir/test_ncdump.sh
 
-isolate "testdir_ncdump_netcdf4"
+# Move into test directory
+cd $NCDUMPPATH
 
-# Move into isolation directory
-cd $ISOPATH
 
 set -e