Q: iTunes won't play quicktime videos on Mac anymore.

Thanks all this thread has helped me. I had the problem of downloading movies from iTunes Store and then they would not play in iTunes. They would play if I opened them dierctly but iTunes reported that I had a quicktime problem.

Went through proceedures with Apple help....they were helpful but did not resolve problem and offered refund

Came across this thread and the workaround of deleting from itunes then adding back to library works totally

I have two reasons for posting now one to say thanks and confirm the workaround but secondly to say that this issue and the developing discussion about NAS are related I think.

I have moved my iTunes library to NAS recently and have set up a log in arrangement so by the time I open itunes library on server is ready as described above. I think I have even downloaded a couple of SD movies since then no problem. I think the last few movies I have downloaded have been HD and I have gone to bed leaving them to download and I think the server connection has "gone to sleep" in some way that means the movies do not appear properly in iTunes. I certainly have not had this probelm with music smaller downloads.

So the original problem and the way this thread has developed are related iHMO!......the solution.....Apple needs to fix iTunes......up to iTunes 9 I never recall having these problems. iTunes does not work well with a NAS without a lot of user interventions. My local Apple store expert pretty much confirmed that as well.

So great thread sorted out all us humble users can do now over to Apple to get better NAS intergration with iTunes

After performing a QuickTime update always do a reinstallation of iTunes and select repair.  This fixes my video playing capabilities in iTunes everytime after a QT update.

Let's face it Apple have lost the bloody plot!! I get seriously ****** of with the dictatorial crap we get from them. Slowly moving towards WINDOZE unfortunately!!

Hey, scanned all the thread and as far as I can understand there isnt a fix if opening it in 32bit doesnt work? When I try I get the error message Itunes itunes needs to be opened in 64bit. I dont understand what NAS is? I've spent all morning just getting itunes to open again - since version 1.1.11 its been an absolute nightmare - and I just need to play the stupid lecture podcasts

grrr

help

I tried playing one of the movies I just bought on itunes but it keeps telling me I have to install Quicktime. so I did....but it still keeps telling me to install it and won't let me watch it

I simply want to rent a movie off iTunes on my Mac, but it gives me this error. Can't even play the trailer in the iTunes store. All my software is up to date and all the other suggestions in many of these threads. I see a lot of the threads refer to 'local files' on your HDD. This is not the case with me. I don't have a local file issue. IN FACT, I tested Quicktime with local HDD files, and its perfect. I've also switched to 32-bit mode which some contributors reckon is a quick fix. Made no difference at all...

Advice anyone?

Same here Im afraid - I'm not trying to play a local file, I am trying to watch a music video on the iTunes store and the error comes up.

Looks like the one hand doesnt know what the other is doing up there at Apple HQ!