For the past several weeks I occasionally have the Develop module get stuck on one photo. I believe it happens when I move over to Library to do some things, then come back to start editing new photos. I can progress through photos in Library but when I try to click on develop to edit a photo, it just shows the photo from my previous editing session and won't move off that. The only solution I have found is to restart Lightroom. Then it starts working again. I read there was a problem with LR crashing when switching from Library to Develop, but mine is not really crashing. None the less I checked out one of the solutions which was to Select Preferences > Performance and deselect Use Graphics Processor. I found that my check box was already deselected, so that does not appear to be the issue.
I realize I need to start another thread for this but in case it ties in with this problem, just today I also started have trouble with my crop tool. The crop box will appear in whatever dimension I specify, but the box cannot be moved or changed in size. Maybe my whole system has become corrupted somehow?
I'm in Lightroom CC. Below is some info from my system if it helps.
Lightroom version: CC 2015.8 [ 1099473 ]
License: Creative Cloud
Operating system: Mac OS 10
Version: 10.12 
Application architecture: x64
Logical processor count: 4
Processor speed: 2.9 GHz
Built-in memory: 8,192.0 MB
Real memory available to Lightroom: 8,192.0 MB
Real memory used by Lightroom: 299.1 MB (3.6%)
Virtual memory used by Lightroom: 3,513.5 MB
Memory cache size: 834.2 MB
Maximum thread count used by Camera Raw: 4
Camera Raw SIMD optimization: SSE2,AVX
Displays: 1) 1680x1050
Graphics Processor Info:
Check OpenGL support: Failed
Vendor: Intel Inc.
Version: 4.1 INTEL-10.25.13
Renderer: Intel HD Graphics 4000 OpenGL Engine
Please make sure that update your Lightroom to version 2015.10.1
It is too soon to tell if updating my software solved this problem, as it was intermittent. But I'm going to mark as correct for now and will repost if necessary. Thanks for the heads up on the software update. I thought I was up to date, but was not.