Lightroom Classic 11.3.1 Camera Raw 14.3 Photoship 23.3.1 Windows 10 Pro v21H2 19044.1645 (up to date) Under normal operations, a raw image in LR is opened for editing in Photoshop using Ctrl-E. When editing is completed, Ctrl-W in Photoshop saves a tif file which is auto-imported into LR and stacked with the original. In my workflow, I do this for groups of images: opening 8-12, processing them all in Photoshop, then returning to LR where their would normally be 8-12 stacked pairs. Starting roughly 5 days ago, the return from Photoshop occasionally fails and causes LR to hang. The observed result, in the library module, is: In library, clicking on the '1 of 2' stacking icon should collapse the stack. It does nothing. The module is hung The library module fails to auto-import multiple tif files. My guess is that this breaks after the module hangs. The files are on disk, just not added to the module. Attempting to optimize and back up on exit fails. The system looks like its going through the process, but it never completes. A normal exit works. On restart, everything is fine, though I have to manually 'add' the tif files that failed to import. Unfortunately, this is intermittent. Sometimes images return normally. Sometimes they don't. But I've had to restart LR 3 times in 5 days as a result of the problem. This bug has also been reported by another user on this thread: https://community.adobe.com/t5/lightroom-classic-discussions/lightroom-locking-up-when-returning-from-editing-in-photoshop/m-p/12892140
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