Lightroom 3.2: Edits disappear after a few minutes

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This is a new bug since I upgraded Lightroom to V3.2 on my MacBook Pro (Retina, Mid 2012). Here's the process I've been using for years: I import raw images from the camera's SD card. I flag the ones I intend to edit. Then I pick one to edit and duplicate it. After anywhere between half a minute to 10 minutes of editing the duplicate, the image goes black. When I go back to the Grid view, the thumbnail for that photo is also black. If I select the adjacent image in the grid to edit, and then use the arrow key to get back to the black one. Then the image reappears, but with all the edits gone.
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Magnus Snorrason

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Posted 4 months ago

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Rikk Flohr, Official Rep

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Greetings Magnus, 

I tried to duplicate this on my MBP 10.14.6 and did not experience the issue after 20 minutes. I have a few questions:
  • What is your OS on your Macbook? 
  • If you turn of the GPU options in Preferences>Performance, does it still happen? 
  • You are connected to the internet while doing this?
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Magnus Snorrason

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Thanks Rikk!

This isn't 100% repeatable for me either, but I'd say at least 80%.

- MacOS 10.14.6
- I've had the GPU option on until just recently, but it's happened twice since I turned it off
- Yes, I'm on the Internet the whole time

Actually, I just now discovered that if I hit Export (shift-command-E) right after the image goes black (still in the Edit view), then the exported jpg has all my edits. Also, when I used the left/right arrows after that, I got the image to pop back up, with all my edits.
(Edited)
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Rikk Flohr, Official Rep

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Any chance you can get a video or screen capture of it in the act? So far you are the sole report on this and if we can't reproduce, I have nothing to bring to the engineers. 
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Magnus Snorrason

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Sure! This happened just now, this time before I had done any significant edits (I had only hit the "Auto" button to check if that would be a good starting point for adjusting exposure). The photo had been in Edit mode for a few minutes because I switched to something else in the browser, but then within seconds of switching back to LR, it went black:


As you can see here, it stays black after that when I switch back to grid view:

(Edited)
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Rikk Flohr, Official Rep

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Does this only happen on Copies?  
Can you get it to fail on a non-copy?
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Magnus Snorrason

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Thanks for the suggestion! I tried a few photos just now and so far I've not gotten it to fail on originals, only on copies.
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Rikk Flohr, Official Rep

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We've written a bug for this. Thanks for the report. 
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Rikk Flohr, Official Rep

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Version 3.3, an update to Lightroom Desktop, went live on June 15, 2020 and contains a fix for this issue. Please install the update and respond back if it does not cure the issue for you. Thank you for your patience!
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Magnus Snorrason

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Unfortunately, the bug is still there. In fact, it's gotten worse: Instead of the image going black, the photo (both original and copy) disappears from the library. This has happened three times now and two of these times when I checked in the finder, the file was gone as well. Fortunately I still had the original on the SD card so I could re-import the photo.

When this happened just now, I tried hitting undo a few times immediately after this happened. That only made things worse: it "undid" my last action on the missing photo (a slight rotate) by rotating the previous image in the library by 90°.

I'm not sure if this is correlated, but since I installed the 3.3 update, the keyboard shortcuts occasionally stop working (e, c, i, p, etc.). Hitting any of those keys just produces the invalid-action beep. The arrow keys and all mouse/touchpad actions are fine. While it's in this state, the File menu becomes empty (it still says "File" in the menubar, but clicking it does nothing). The other menus are fine. The problem can be cleared by restarting Lightroom, but sometimes it also goes away on its own.

I'm still running 10.14.6, with the GPU in "Auto" (same as before).