Hey man, thanks for replying, unfortunately I don't have the above in my mod (yet) but I've already taken into account the Snathi files that are relevant in my mod (aka UI colour defs) by copy / pasting the relevant Snathi data from the original file.
I have since made some tests and found:
The mod works fine if I deactivate the Snathi DLC.
It also works fine if the mods are deactivated
It also works if I have mods on, but the Snathi are Not one of the contending races.
It crashes (to desktop) however if the Snathi are in game with mods active.
Seems like theres a red a conflict there somewhere. Would be good to have some Dev input.