Changing the Stored Procedure Cache (PC_POOLSIZE)

Hi there, We have ODS 7.10 on SCO OSR5. We tried changing the PC_POOLSIZE parameter to increase the size of the stored procedure cache. The performance gains are fairly dramatic. However, we now have an unstable system. Every once in a while, we get a: Assert Failed: Internal Error - Segmentation Violation. By removing PC_POOLSIZE from onconfig, we get a stable system. Can anybody help? Any reason why PC_POOLSIZE is not the manuals? Thanks Bashar Chalabi Card Tech Ltd