Just ran into this apparently known bug today. The fix is either to upgrade to 6.2 or copy the pre SP1 file named intgserver.jar over the top of the existing one. Unfortunately, our support has expired so I'm unable to get 6.2, and the link to the replacement file found at the bottom of:
in the workaround section is no longer working. Anyone know how I can get a copy of this file, or if there's some othe fix for this issue?