Hi there!
It is a bit late, but, nonetheless I did not want to leave this thread with no replies.
The upgrade from 1.X series to 2.X was a bit tricky, specially if you had lots of data. Having a good server also helps, but even so, for some people it took over 72 hours to complete the upgrade.
Concerning the issues you are experiencing, I am going to private message you as they are quite strange.
Best regards,
Francisco