My default Quicktime Player that comes with OS X 10.9.5 stopped working. When trying to open, I get a 'Problem Report QuickTime Player' with options 'OK' and 'Reopen'. Neither option works. Needless to say I can not play any videos. This is NOT due to upgrades, it was working but overtime it started developing problems. I think it just got damaged or corrupt and needs to be reinstalled. This is on a Macbook Pro with OS X 10.9.5. This Quicktime ver (10.3 I think) came with the OS.

May 10, 2010 Download QuickTime Player 7 for Mac OS X v10.6.3 QuickTime Player 7 supports older media formats, such as QTVR, interactive QuickTime movies, and MIDI files. It also accepts QuickTime 7 Pro registration codes, which turn on QuickTime Pro functions.

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Tried to uninstall it but get a message that Quicktime is part of the OS, so I stopped. Also don't know where I can get a copy of this ver of Quicktime Player.

So I'm not sure what the process is to fix it. Any pointers for this new Apple newbe would be appreciated.

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Is the problem local (shows up in only user account) or global (shows up under all user accounts)? If local, then the problem may only be a corrupted PLIST file for QT X in that account's 'Preferences' folder. If global, then the problem may be corruption in the app itself, the operating system or some sort of software conflict. In most cases a global problem is more easily fixed by re-installing the entire system than by trying to diagnose, isolate, and fix a specific problem. Another possible solution (if you have a spare external drive), would be to create a pristine, secondary start-up system and use it to troubleshoot the original system problem which can be a lengthy, time-consuming proposition.

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Dec 9, 2014 7:07 AM