MS CRM Changing business unit for a user gives an error

We were trying to change the business unit for a user and it was giving us CRM error.

We already have increased the timeout long time ago by adding the registry keys as instructed here http://support.microsoft.com/kb/918609

Still having the same error.

Lastly we tried cleaning up the Async table as instructed here http://support.microsoft.com/kb/968520

After doing this we were able to change the business unit for the users