Index: modlib/modeller/parallel/job.py
===================================================================
--- modlib/modeller/parallel/job.py	(revision 11699)
+++ modlib/modeller/parallel/job.py	(working copy)
@@ -54,11 +54,18 @@
         return 'localhost'
 
     def get_default_modeller_path(self):
+        def quote(pth):
+            # quote the path if it contains spaces so as to not confuse
+            # the shell
+            if ' ' in pth:
+                return '"%s"' % pth
+            else:
+                return pth
         bindir = modeller.info.bindir
         modpy = os.path.join(bindir, 'modpy.sh')
         modslave = os.path.join(bindir, 'modslave.py')
         if os.path.exists(modslave) and not _modeller.mod_embedded_get():
-            path = sys.executable + " " + modslave
+            path = quote(sys.executable) + " " + quote(modslave)
             if os.path.exists(modpy):
                 path = modpy + " " + path
             return path