This bug has been acknowledged by Adobe in the official Adobe feedback forum: Lightroom: Image stuck in Develop mode | Photoshop Family Customer Community . Please add your me-too vote and details of your configuration to the bug report to make it a little more likely Adobe will prioritize a fix.
As a workaround, invoke Photo > Delete Rejected Photos from Library rather than Develop.
Having read the description of "Image Stuck in Develop Mode", it sounds to me as if these are two different issues. Or perhaps there's one underlying bug (triggered by using Delete Rejected while in Develop), but it manifests in two different ways.
I'll 'me-too' the other report in the hope that if it is one bug, a fix for the one that you observed will also fix the anomalous behavior that I'm seeing.
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The core problem seems to be doing Photo > Delete Rejected Photos from Develop. At least three different symptoms have been reported in that thread and the other threads it links to -- Develop gets stuck on a photo, you get an "Error changing modules", or you get a grey screen changing modules.
I use LRoom CC and am also having the same issue - after x'ing several images to delete in the develop mode, and pressing Command/Delete, LRoom freezes. This issue began as soon as I upgraded to LR 2015.8 Release. At the time I upgraded LRoom, my operating system was ElCapitan 10.11. In attempting to correct this problem I reset the Preferences by holding Shift-Option-Delete to get to my Preferences. This did not correct the problem. Then I changed LRoom's permissions which also did not help. Finally I deleted LRoom CC 2015.8, updated my Mac Operating System to Sierra, re-installed LRoom CC 2015.8 and the problem continues. The only difference was that before I deleted LR CC 2015.8 and upgraded to the MAC Operating System of Sierra and then re-installed LRoom CC 2015.8, I would get a message on the screen telling me, "An error occurred when attempting to change modules". Now there is no message, it just freezes on the image on the screen. I will try deleting images while in Library rather than in Develop and hopefully this will work and hopefully Adobe will correct this problem soon !!
Sounds like the same issue, and it's one that others have encountered as well. Please see the comment by @johnrellis above and follow his link to add your 'me-too' to a comment thread at the Photoshop Family forum; this will help make Adobe aware that it's a problem that is affecting numerous users.
I also am getting the same error - and yes after the last LR update. I can't always replicate it, but yes, after I've done main edits and deletes in Develop, it seems to happen. I shall try to delete images from the Library module but will report it as above.
Thank you - I've been hoping to find someone else who had the same issue.
Using LR / PS CC on Mac with Sierra.... I've also uninstalled, reinstalled, reset preferences - got rid of Nik Software and unchecked Graphic Processor acceleration. (Still waiting on the last one to see if it improves things).