I had mentioned this elsewhere but thought about officially posting here.

In certain circumstances Kratatmos will hang max when PRT FumeFX has unfilled prerequisite channels. ie no fuel = block at render time evaluation of atmospherics.

This will be fixed for the next beta build.

You sir deserve a thanks

Could this be similar to why my Box 2 hangs from another post? Insuffienct channel data?

Most likely not related.