Index: trunk/Ohana/src/opihi/lib.shell/check_stack.c
===================================================================
--- trunk/Ohana/src/opihi/lib.shell/check_stack.c	(revision 40328)
+++ trunk/Ohana/src/opihi/lib.shell/check_stack.c	(revision 40329)
@@ -48,6 +48,6 @@
 	  Nz = stack[i].buffer[0].matrix.Naxis[2];
 	} 
-	if ((Nx != stack[i].buffer[0].matrix.Naxis[0]) && 
-	    (Ny != stack[i].buffer[0].matrix.Naxis[1]) && 
+	if ((Nx != stack[i].buffer[0].matrix.Naxis[0]) ||
+	    (Ny != stack[i].buffer[0].matrix.Naxis[1]) |
 	    (Nz != stack[i].buffer[0].matrix.Naxis[2])) {
 	  push_error ("dimensions don't match");