Sage have just issued a second hotfix for Sage ERP MAS 200. This one seems to address an issue found only in MAS200 where master developer enhancements were at one time (or possible still are) installed.

Because the issue seems particularly tricky to track down – I thought it might be good to post the report and link to the fix.

Error 46 SY_Session.pvc or Error 11 Sy_Session.pvc in MAS 200 v4.4