1. Bugsplat have "View Report Details" button, that probably would explain cause to tech experts here?
2. Most probable cause (my non expert opinion): You are running out of VRAM. Older versions reserved max 2048Mb, newest version - like Black Dragon - have option for automatic VRAM assignment settings with more advanced options. Now probably main viewer window uses more VRAM for textures, leaving less to snap shot rendering - then failing.