Hi Jay,
Quick looks at your log file, there's nothing serious I can see that may explain this.
The most likely reason I can think of is that there is still a Gizmox designer DLL laying around somewhere (in the GAC, in Path or in the project) that's originated from the Express version, but I don't get it how a VS2010 Express installation can interfere with VS2008 Professional.
I will check tomorrow if this may be license related, and that installing VS2010 express might have changed the license. Not sure if it will, but that's about the only idea I have right now. Can you see if the licensing filemay have changed during these express installations, by using this article here to locate the file ?
Palli