I am running Lightroom 6.0 on a 2010 MacBook Pro. When I am in Develop mode and move from one photo to the next, the program crashes.
My system info follows, in case it is helpful. Please, only respond with solutions, not "I have this problem, too." Thank you!
Lightroom version: 6.0 
Operating system: Mac OS 10
Version: 10.10 
Application architecture: x64
Logical processor count: 4
Processor speed: 2.6 GHz
Built-in memory: 8,192.0 MB
Real memory available to Lightroom: 8,192.0 MB
Real memory used by Lightroom: 714.6 MB (8.7%)
Virtual memory used by Lightroom: 2,619.4 MB
Memory cache size: 302.3 MB
Maximum thread count used by Camera Raw: 2
Camera Raw SIMD optimization: SSE2
Displays: 1) 1680x1050
Go to Lightroom Preferences > Performance > uncheck "use graphics processor" > relaunch Lightroom and then, check.
Also, update the program to 6.5.1: Keeping Lightroom Up-to-Date