Re: just blank pages after upgrade 1.9.11 -> 2.0
hmmm (don't read on if you only like happy endings)
well, i thought: lots of frustrated visitors, lets quickly copy the 1.9.11 files back, and restore the 1.9.11 database. When I did, mysql never gave a confirmation message. That was a bit strange, obviously. Anyway, the site didn't work either. So i started investigating and found out the backed up databases had a lot less tables than the original. The last table is 'sessions', and that one is empty.
So in fact I think I've tried to restore a faulty backup file over the live database and the other backups that I have all have the same problem.
In other words: I think I'm seriously f**ked, unless you have a miraculous solution or you are the son/daughter of some god and mend these things for fun. (In which case you probably won't need more details, and everything will work fine in 30 minutes or so?)