Thanks for the fix!
Every time I tried to install/upgrade an app from Market it would say that this app can't be istalled on phone or usb storage. I even tried to install apk files thru manager and it didn't work anymore.
What I did was:
1. Freeze "Market updater" in Titanium Backup (pm disable does the same thing!)
2. Go in Settings-->Applications-->Manage applications-->All-->Google Shop and clear cache+data and then "Uninstall updates".
3. Restart tablet and Market should work once again!
Someone could also post a link to old version (last version before Market was transformed into Google Shop).