Index: /issm/trunk-jpl/m4/issm_options.m4
===================================================================
--- /issm/trunk-jpl/m4/issm_options.m4	(revision 26803)
+++ /issm/trunk-jpl/m4/issm_options.m4	(revision 26804)
@@ -210,5 +210,6 @@
 	SYSTEM_FMEMOPEN=1
 	if test "${IS_MAC}" == "yes"; then
-		if [[ $(system_profiler SPSoftwareDataType | grep "System Version:" | sed -e "s/[[:space:]]*System Version: macOS //" | cut -d "." -f 2) -lt 13 ]]; then
+		sys_ver=$(sw_vers -productVersion)
+		if [[ $(echo ${sys_ver} | cut -d "." -f 1) -eq 10 && $(echo ${sys_ver} | cut -d "." -f 2) -eq 13 ]]; then
 			SYSTEM_FMEMOPEN=0
 		fi
Index: /issm/trunk-jpl/src/m/classes/calvingvonmises.py
===================================================================
--- /issm/trunk-jpl/src/m/classes/calvingvonmises.py	(revision 26803)
+++ /issm/trunk-jpl/src/m/classes/calvingvonmises.py	(revision 26804)
@@ -56,4 +56,5 @@
 
     def marshall(self, prefix, md, fid):  # {{{
+        yts = md.constants.yts
         WriteData(fid, prefix, 'name', 'md.calving.law', 'data', 2, 'format', 'Integer')
         WriteData(fid, prefix, 'object', self, 'fieldname', 'stress_threshold_groundedice', 'format', 'DoubleMat', 'mattype', 1, 'timeserieslength', md.mesh.numberofvertices + 1, 'yts', yts )