QT 7.1: App itself and iTunes wont launch anymore

i have updated QT 7.xx to 7.1 on a 10.3.9 this morning. now QT and iTunes won't launch no more. there is no warning or anything, but the programm windows wont open.
HELP please.

That sounds really bizarre, but somewhat isolated...not seeing/hearing of this widespread.
Are you clicking on the app itself, or files that you wish to be associated with the app?
Do you somehow have more than one instance of QT on the same computer? or same partition--more to the point.
I would
-make sure I didn't have multiple versions on the same partition.
- check "get info" on files you think should be associated with an app...see that they still report being associated with it.
- repair permissions
If no change in behavior yet, then:
- uninstall
- reinstall and again repair permissions.
good luck

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