Error occurred upgrading the machine

Hi,
After upgrading my development machine (Win7 x64) and a few clients (Windows 2008R2 x64) to SP1 (x86), I started to get strange issues. Why I would get strange errors, such as ‘The setting your entered isn’t valid for this property, orAction Failed Error Number: 2950, or Runtime Error 3270 Property not found.?

Phoenix:
The expression On Change you entered as the event property setting produced the following error: The setting you entered isn’t valid for this property.
The expression may not result in the name of a macro, the name of a user defined function, or [event Procedure].
There may have been an error evaluating the function, event,or macro.
