Index: /issm/trunk-jpl/test/NightlyRun/test408.py
===================================================================
--- /issm/trunk-jpl/test/NightlyRun/test408.py	(revision 21612)
+++ /issm/trunk-jpl/test/NightlyRun/test408.py	(revision 21613)
@@ -14,7 +14,7 @@
 md=setmask(md,'../Exp/SquareShelf.exp','')
 md=parameterize(md,'../Par/SquareSheetShelf.py')
-md.geometry.bed=md.geometry.base
+md.geometry.bed=copy.deepcopy(md.geometry.base)
 pos=np.nonzero(md.mask.groundedice_levelset<0.)
-md.geometry.bed[pos]=md.geometry.base[pos]-10
+md.geometry.bed[pos]=md.geometry.bed[pos]-10
 md.friction=frictioncoulomb()
 md.friction.coefficient=20*np.ones(md.mesh.numberofvertices)