Problem:

Trying to anim Pro*COBOL programs  results in a blank screen.  Animating pure COBOL program works fine.

CTF and truss traces show a 115 error in dispatch.gnt and then the process appears to hang.

Resolution:

The problem can be resolved by applying an IBM patch to AIX for APAR IY80008.

Apparently the issue shows up when the bos.rte.libpthread package is version 5.3.0.30. If you use 5.3.0.0 debugging works correctly. The issue does not show up on our AIX 5.1 or AIX 5.2 machines, which use an older still version of libpthread.

You can find a little more information on the problem via this link:

http://www-1.ibm.com/support/docview.wss?uid=isg1IY80008

There's another link at the top of this page to go to a download page to get the fix.