Just a quick follow-up on this problem from last week. After bumbling around in web searches I eventually came upon THIS<http://social.msdn.microsoft.com/Forums/vstudio/en-US/dfe4100a-6228-46ab-89f3-5c3c05ab5098/visual-studio-2010-ultimate-doesnt-remember-previously-opened-files>. I exported by settings, reset them, then imported all settings except Windows Layouts and it's looking okay. I suspected something like this would solve the problem, but I couldn't face hours of experiments to try the various combinations. Luckily someone did it first. I'm actually sceptical that omitting the Windows Layouts was critical to the fix, as perhaps the reset step simply fixed things, but I can't waste time trying to find the exact fix steps.
Also, months ago I had changed VS2012 settings Environment > Import and Export Settings > Automatically save my settings to this file ... to point to a file on a network shared drive letter which was regularly backed up. After running the reset steps above and running VS2012 as Admin I was getting a file access error because the network shared letter was unknown to admin. I changed it to \\unc format and fixed the problem, but it's weird I never saw that error in previous months. Greg K
