P: Can not exit/switch Full Screen Preview (F Key) mode (LR Mac)

I've found I can get back to the other screens by first restarting 5.4 and then pressing shift F. However, the problem comes back, seemingly at random. Annoying, and Adobe should provide a fix.

I totally agree and for people who encounter this problem, follow the sequence describe by Henry.
Plus I'm not sure if this solution will be stable. Actually, I had this problem a few days ago (after updating) then it was gone (why, I've no Idea...) and it came back yesterday... very strange!
So, as Henry says, we should keep this thread open.

Okay, gave it a new try as mentioned by Emmanuel, works.
(Seems leggit, that the update damaged the pref-file).

The key seems to be:

- running 5.3
- update to 5.4 (DO NOT START IT!)
- delete "com.adobe.Lightroom5.plist"
- start 5.4

But it is interesting, that starting 5.4 - right after the upgrade -
and deleting the pref file afterwards doesn`t work.

There must be a another place where prefs are stored - in 5.4.

Saying this, we should keep this thread open, till there is a
official fix, because this is only a workaround, with no guarantee
to work always and under all circumstances.

I was not completely satisfied to roll back to LR 5.3 and I give a new try to 5.4 after contacting Adobe Support Chat Team Member. They are now recognizing that there is a problem (Updating may corrupt preferences file).
So, I update again to 5.4, delete "com.adobe.Lightroom5.plist" from the library and now, it seems to work.

I meant if Adobe could fix the problem

5.4 deleted, 5.3 reinstalled and everything is now working.
Nevertheless, it would be nice if you could identify and correct the bug...

Yes, great! :-)

- LR is running on the mainscreen, which is the second monitor. This monitor is also the mainscreen for Mac OS X.

- The second window is normally opend.
- I'm the Bibliothek, GridView (German version).
- My presets will not be saved with the catalogue.

What I've tried:
- Disconnecting the second monitor, rebooting, 5.4 - F
- Declared the MacBook Pro Monitor as main Monitor
- Deleted the complete /Users/xxx/Library/Caches/com.adobe.Lightroom5/
- Deleted /Users/hcb/Library/Preferences/com.adobe.Lightroom5.LSSharedFileList.plist
- Deleted /Users/hcb/Library/Preferences/com.adobe.Lightroom5.plist

Nothing worked.

- Created a new User - no problem. 😞

I still haven't been able to reproduce it, so let's run through the exact steps you take to get it into that state. For example, you mentioned a second monitor - is Lightroom on the laptop monitor or the second one? Is second window open or closed? Which module are you in at the time? And since sync is the main latest addition, is sync enabled or disabled on your catalog?

Thanks! 5.3 (paralel installation) is done, and 5.3 behaves normally.
Only 5.4 have the problem.

According to a "Adobe Support Chat Team Member", this is NOT a LR problem.

Even if you install 5.3 under the same account (which will work without any problem) it is not a Adobe problem.

Maybe Apple programmed something like: (If LR > 5.3 do not allow to leave Fullscreen)...