strange bug in GWX 2.1

[Reece]

ASDIC sound
GWX - Contact Colour
GWX-My Favourite dails mod (<- with the fix already in it)
New SHIV Scene 8k v2.5b

I'd say that none of theses would cause the type of problem He's having, the first could cause a CTD if certain ogg files used, the next 2 are basically only menu edits, and would cause a CTD with error message if any problems, the last definitely not this type of problem.
The earlier enabled mods:
Copulsory Headdress - menu & cfg alterations only, so no problems.
GWX 2.1 sil tga fixes - only tga files in rec manual & tested so no problems.
Increased ASW - not familiar with this mod so can't comment.
LRT Super LITE v1.35 - as above.
Water_Stream_for_Uboats_v4 - have been using with GWX 2.1 for a few patrols now so not likely.
Smoke Exhoust Pack GWX - not familiar with this mod so can't comment.
Hope that is of some help, just my opinion.