[cflsystems]

This doesn't make much sense. XC5 was supposed to be one-click painless upgrade. The main idea on giving up onXC4 and moving to XC5 was to have flawless upgrades. So when core is upgraded all modules stay and continue to work or they need very little adjustment.

From I am reading this is not the case. If you are not isolated cases and this is common to upgraded stores I just don't see how XC5 can be better than XC4....

BTW I had only one of my modules not working properly between 5.2.10 and 5.2.11+. So maybe the problem is not in the XC5 upgrades but in the custom coded modules you have from QT... just saying, it is one of the possibilities.