Index: /issm/trunk-jpl/src/m/classes/groundingline.py
===================================================================
--- /issm/trunk-jpl/src/m/classes/groundingline.py	(revision 17035)
+++ /issm/trunk-jpl/src/m/classes/groundingline.py	(revision 17036)
@@ -50,5 +50,5 @@
 			if any(numpy.abs(md.geometry.bed[pos]-md.geometry.bathymetry[pos])>10**-10):
 				md.checkmessage("bathymetry not equal to bed on grounded ice!")
-			pos=numpy.nonzero(md.mask.groundedice_levelset<0. & md.mask.ice_levelset>=0)[0]
+			pos=numpy.nonzero(numpy.logical_and(md.mask.groundedice_levelset<0,md.mask.ice_levelset>=0))[0]
 			if any(md.geometry.bathymetry[pos]-md.geometry.bed[pos]>10**-9):
 				md.checkmessage("bathymetry superior to bed on floating ice!")