Don’t know if I can help, but from my experience (and others I’ve read) Cubase does strange things sometimes, no matter which version…like freezing when trying to close Cubase, etc. Your problem may be similar to the widely experienced ‘close’ & then freeze issue I suspect. Odd thing for me is, at one point it was fine, then at another point freeze.
When you uninstalled/reinstalled, did you make sure there wasn’t any left over files from Cubase floating around (including the registry) before reinstalling? No matter what it is, there always seems to be left overs. And/or how exactly did you uninstall Cubase?
After it was reinstalled, did you 1st open the saved projects before, did you just press ‘save’ 1st? Or did you press ‘save as’ 1st? I would do ‘save’ 1st, as I would at least tend to think ‘save as’ may have to do a little more work.
You may want to check your directory paths where ever possible too, for all your songs, VSTi’s etc. And while at it, make sure you’re using the same sample/bit rates now as when the projects were created.
I’ve also experienced weirdness on how I even ‘open’ a project…like in whether I open a song from the song file itself, or just open Cubase from it’s Cubase desktop icon. I’ve for some reason had Cubase freeze when I open the project song file, where as less problems from just opening Cubase 1st, then open the song file from my recent projects list, or from the top drop down list.
Sometimes installed FX’s or VSTi’s can foul things up too. Since you uninstalled/reinstalled, I would refresh all my VSTi’s in the instrument list. I posted some info just the other day about this, I’ll try to find that and repost that here on ways of doing this.
By the way, this is the same machine you used to have SX on right?