v10.14.5 update seems to have disabled full screen video expansion on the mac?

I have the exact same issue on a Mac mini 2018 running Mojave 10.14.5 (which includes iTunes 12.9.5.5): when trying to play movies full screen in iTunes, the screen will go black - unless I keep the on-screen control bar in the bottom visible or move the mouse (which amounts to the same).

I had no problem on Mojave 10.14.4 - this is a bug that was introduced in 10.14.5.

See https://discussions.apple.com/thread/250382242

My Mac mini 2012, also on Mojave 10.14.5, does not have this problem.

There are several others with the same problem, where Mojave 10.14.5 and Mac mini are the common factors.

https://discussions.apple.com/thread/250368946

https://discussions.apple.com/thread/250379316

I tried contacting Apple Support. You can apparently not email them, but you can request them to call you via the support pages. That is what I did. I got an email from them confirming they got my support request (with ticket number). But even though their support pages state that they will call you back within 2 minutes, I am still waiting for their call now 3 hours later...

macinsale33 wrote:

of course not, I just kept trying to make it work!

but yes, after posting the issue too soon, I did restart twice and the issue seems to have fixed itself,

so thanks for your reminder ...

Good computing macinsale33 !

I have the same problem, on a new Mac mini. Movies will play full screen if I put the cursor at the top (so the menu bar is visible) but not if it's anywhere else. They play fine while the controls are visible and then go blank (black screen) when the controls hide. This is in QuickTime and BBC iPlayer Downloads, but not in VLC.

Have rebooted, deleted QT preferences, changed display settings to scaled at different resolutions, etc.

If I access the machine remotely via Share Screen it doesn't happen – it plays 'full screen' fine in the window on the remote computer.

Anyone else getting this?

I'm having the exact issue. But only recently, since the 10.14.5 update. If I take any video fullscreen in Quicktime, as soon as the controls fade away, the screen goes black. And the video reappears if I move the mouse to bring the controls back up. This was not an issue previously. And I have an external drive that still has 10.14.3 on it and if I boot from that I have no issues with video playback.

I am having the same exact issue. Rebooting and NVRAM reset has done nothing. I am using an HP Pavilion 32" monitor that is brand new. What monitors are you all using? I will say that this issue is only occurring on my newest monitor. It is not occurring on older monitors. Apple Support, looks like you have a bug to fix!!!

I am using a Dell P2415Q monitor. My older Dell S2409W monitor has the same issue as well if I plug my Mac mini into it. You should submit feedback to Apple. I've done that and the more people who do will make them more aware of the issue.

I just chatted with support and here's the latest update:

"this issue is being investigated by our engineers. Their notes for this issue was to make sure and keep your Mac updated as the fix for this issue will come in an update, and the best work around for this issue at this time would be to watch the movies in non-full screen."

So it looks like in the next MacOS update (hopefully soon) the issue will be resolved :)

I have a 2018 mac mini running on a LG 32UD59 (32" 4k monitor) with the same issue. ***** that this issue hasn't been fixed yet, but at least it seems to be isolated to Mac Mini 2018 model and perhaps other models with the same intel graphics.

[Edited by Moderator]

Did you try rebooting your machine?

I have been talking to their support team and actually have a call with them tomorrow to get their engineers involved and working on the issue. So hopefully this gets it fixed.

Did you have any luck with your call with the support team please?

The issue has been escalated to the engineers and they are now working on a solution. So hopefully it'll get solved!!

Same exact problem with a 2018 Mac mini!

I have the same exact issue and it happens both on my 1080 monitor and my 4K TV. What's wrong with apple? Shouldn't someone just come out and give a bypass solution first?