Attached is a screen shot of the settings prior to crashing. Every time I replicate it I get the same result. I'm using a distorter filter in the Diffuse, Reflection and Bump channels. It seems to only crash when changing settings in the bump. In the distorter settings there are some options to change the type from "Directional, Bidirectional and Flow field". If i set flow field on all activated settings (diffuse, reflection and bump) I get a delayed crash of about 3 secs after engaging it. Directional and Bidirectional are fine.