If you look at that path in the filesystem (rather than in CCPRO), does the file exist? As that user, can you manually create a file in that location via Windows Explorer?Have you checked iwutild.log and iwutild_cmdout.log to see if there are any errors there that might enlighten you?What happens if you run the corresponding iwpt_compile.ipl command as that user?
try upping the preview_limit in iw.cfg. If that file gets submitted (via iwsubmit) then deleted you have problems.