Hello I am new to cctbx user world and facing problem with cctbx working. I am having working python code with 3 libraries- Scipy Numpy cctbx I am using Enthought EPD which has python 2.6, scipy and numpy. http://www.enthought.com/products/epd.php All these things are working fine and then I installed cctbx from http://cctbx.sourceforge.net/current_cvs/installation.html#manually-building... (from Windows 2000 and higher) cctbx test cases are also running fine as there are no traceback calls.(test outputs are attached) However when I am running my python code it is giving error at cctbx interface. print "*** Executing cctbx" p2 = Popen(cmmd2, shell=True, bufsize=bufsize, stdin=PIPE, stdout=PIPE, stderr=PIPE) output2 = p2.communicate(input = allout) Here input (allout) is not empty but still output2 is coming empty which causes problems in next processing. It would be really great if you can tell me what problem is exactly and resolution on it. Please help me out in solving this issue.Let me know if you need more details. Hoping for your positive response!! Thanks in advance!!! -Swapnil U. Shinde