Citrix Server Blue Screen 3 times a day.

We run a Citrix Metaframe 1.8/Win2k Server on a Dell Poweredge 64000 with Quad Xeon processors and 4 GB RAM. It blue screens 2-3 times per day with the following:

SESSION_HAS_VALID_POOL_ON_EXIT (0xAB), followed by three memory addresses.

The Blue Screen always happens around morning, lunch, or quitting time, when many users are logging in and out.

We have applied all service packs and patches, and everything short of upgrading to Metaframe XP. Spoke to Microsoft, and they stated the cdm.sys file is the cause, but offered no solution. We tried replacing cdm.sys from backup and pulling it from previous service packs with no result.