Did you already try the new printer system...
It is completely renewed (you'll see the difference also in PCC)...
Until now, it only lead to better detection at the computers and printers here....
Maybe, if you have done much configuration, you can try to use 'mylivecd' to make a custom OS (based on the thing you're running now), so that you can install the current version again if you're doing something wrong
(you'll find more information on the forums here)....
Then you can go ahead and try the update (however you can do it also without making the backup install-cd)