Does any of this sound familar? You should be talking with your reseller right about now. Also I found this by going to the Sage Support web page, logging in, going to the Knowledge Base and entering "Error 88 SY_CommonUI.PVC" this is what came up. Learn to use the KB, it's your friend.
Error 88 SY_CommonUI.PVC line 539 when opening any task
Entry Type: Program Issue
Product: Sage MAS 90 ERP, Sage MAS 200 ERP
Application: Library Master / System Setup
Version Reported: 4.10.1.7
Subject:
Error 88 SY_CommonUI.PVC line 539 displays when opening any task.
Steps to Duplicate:
This is one possible scenario:
Install version 4.10 of Sage MAS 90.
Install Service Pack 1.
Install Service Update 7.
Begin to install Service Update 7 again. At the "Ready to Install the Program" window, abort the installation.
Go into Sage MAS 90 and open any task. The error displays.
Expected Behavior:
The error should not display.
Possible Workaround:
Completely reinstall the service update