Hi Paul,
Thank you for your post.
Frankly speaking, this might be hard to troubleshoot online since there would be many causes for thescenario to happen.
However, you can try the following steps to deal with the case:
1. Tryrunning devenv /Safemode to see if you can open it correctly.
2. Reboot the machine into Safe Mode. This can isolate some third party application/driver's interference.
3. Switch to try a new user account. This can rule out the possibility of corrupted user profile.
If no avail, please trythe Process Monitor tool
http://www.microsoft.com/technet/sysinternals/utilities/processmonitor.mspx which can capture the access log.
Filter on the process name devenv.exe in the log so that you see only the related list.
This should give you more info on what are the registry keys/ files being accessed when thescenario happens.
Hope this helps. If you have any concern, please feel free to let me know.
Best regards,
Yichun Chen
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