Jack You...Did you resolve it?
Because I try many options...and nothing...I'm using SAP B1 9.0 PL5
When you explore ActivityLog.xml we find:
Could not load file or assembly 'B1Studio.UserPreference.2010, Version=1.0.0.0, Culture=neutral, PublicKeyToken=82b98416541d2843' or one of its dependencies. An attempt was made to load a program with an incorrect format.