What is the exact version number of your Lightroom (go to Help->System Info and tell us what version number of LR is shown on the first line)
What version number of the graphics driver installation have you installed?
Hi, thanks for the quick reply
My lightroom version is: CC 2015.10.1 
My graphics card driver is: (new crimson drivers for R9 3xx cards) 17.5.2
Im using Windows 10 64 bit by the way
I have the same version and am experiencing the same problem.
It was crashing before the update, I updated it and it is still crashing.
I updated Windows and it is still crashing.
Lightroom opens fine, it imports files fine, but as soon as I click on develop it is crashing.
It does not give me an error report.
Hoping Adobe has some answers!
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The current release (Lightroom 6.10.1 / Lightroom CC 2015.10.1) has a known problem with driver version 17.4.4. It is possible that the issue has not been fixed and also occurs with 17.5.2; you might want to try the solution here: Crash Camera Raw or Lightroom
Same problem with me.
Lightroom version: CC 2015 
License: Creative Cloud
Operating system: Mac OS 10
Version: 10.12 
Application architecture: x64
Logical processor count: 4
Processor speed: 3.2 GHz
Built-in memory: 32,768.0 MB
Real memory available to Lightroom: 32,768.0 MB
Real memory used by Lightroom: 2,145.2 MB (6.5%)
Virtual memory used by Lightroom: 2,907.1 MB
Memory cache size: 725.5 MB
Maximum thread count used by Camera Raw: 4
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Displays: 1) 5120x2880
Graphics Processor Info:
AMD Radeon R9 M390 OpenGL Engine
Check OpenGL support: Passed
Vendor: ATI Technologies Inc.
Version: 4.1 ATI-1.51.8
Renderer: AMD Radeon R9 M390 OpenGL Engine
Only to add that I disabling the GPU and besides that it still knocked down iMac and restarts. I can not export 300 photos at once.
It's not clear to me that you have the same problem. Just because you say you have the same problem does not make it so. You have a different version of LR than the others, and you are reporting the entire computer crashes, which the other are not reporting (they report Lightroom crashes). If I am understanding everything properly (and I may not be) these are very different things. So either tell me I'm misunderstanding you, or please start a new thread and describe your problem in detail. (And try updating your Lightroom to the latest version)
Hi again, I read the article and gave It a shot, I did a clean install of the crimson driver 17.4.3 (mine was 17.5.2, and the article mencioned that the problem began with the 17.4.4), but at least with this driver version the problem persist...
Anyone has tried a diferent version of the driver that works?
Thanks for the help dj_paige
You understand well, but my problem in 50% of cases the whole computer is restarted, and sometimes only lightroom. There are no rules now I provide export photos, and there are no problems. Lightroom is the last version to which I have to update. iMac also have last update.
Hi, after some long reading and testing I finally solved the crashes!
Following the lead of the article regarding crashes in cameraw and lightroom due to drivers not working properly in those programs, I finally found that the Crimson driver version 17.2.1 works just fine!
Hope this gets fixed soon anyway.
Thanks for the help!