Oh .. I'm slow typing at this time ...

Safe boots & repairing of permissions is recommended after installing new software. Then reboot normally of course before you open LW. BTW which version of QuickTime do you have? Do you still have remnants of QT 6 or earlier on your system? Have a look at your receipts folder & see if there are earlier versions. This might not be a fix but possibly be related. Tell us if you find earlier versions.

I was wondering ... unless you've done a complete reformat of your disks, I presume you still have some old softw on your system.