This is an issue I came across after upgrading our SharePoint and Project Server 2007 environment into SharePoint and Project Server 2010.
Issue
Any updates made to the Risks or Issues lists in the Project Workspace (PWS) were not being carried over from PWS to the Project Web Application (PWA)
PWS Risks List:
PWA Issues and Risks Page:
You will notice that the Active, Postponed, and closed count is not correct. If you go to SharePoint Logs, you will find a critical error complaining about references to the old Project Server assembly, viola!
Error
01/03/2012 14:11:14.59 w3wp.exe (0x246C) 0x1860 SharePoint Foundation General 6644 Critical Event manager error: Could not load file or assembly 'Microsoft.Office.Project.Server.PWA, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c' or one of its dependencies. The system cannot find the file specified.
Solution
I noticed that all the event receivers linked to those two lists are still referencing Version=12 assembly and not the new Version=14.
To resolve this issue, update all the event receivers to reference Assembly: Microsoft.Office.Project.Server.PWA,Version=14.0.0.0,Culture=neutral,PublicKeyToken=71e9bce111e9429c
You are welcome!