So, I was having a hell of a time getting 15.06 to slice. CuraEnginge.exe kept crashing, no log file would be generated and windows error message mentioned something about libgcc_s_dw2-1.dll was causing the problems. Launching CuraEngine.exe by itself would mention "error: failed to load json file: fdmprinter.json" To get 15.06 running again I uninstalled vcredist_2010_20110908_x86, then reinstalled. I also removed the printer that was listed under Machine, and started fresh.
Hope this helps someone.