Perhaps this will help:
Assert: (bm_bitmaps[n].handle == bitmapnum)
File: bmpman.cpp
Line: 1978
bitmapnum = 475271, n = 271, bm_bitmaps[n].handle = 750771
gß^¹P‘|üß^! KiFastSystemCallRet
gß^¹P‘|üß^! WaitForSingleObject + 18 bytes
gß^¹P‘|üß^! <no symbol>
gß^¹P‘|üß^! <no symbol>
gß^¹P‘|üß^! <no symbol>
gß^¹P‘|üß^! <no symbol>
gß^¹P‘|üß^! <no symbol>
gß^¹P‘|üß^! <no symbol>
gß^¹P‘|üß^! <no symbol>
gß^¹P‘|üß^! <no symbol>
gß^¹P‘|üß^! <no symbol>
gß^¹P‘|üß^! <no symbol>
gß^¹P‘|üß^! <no symbol>
gß^¹P‘|üß^! <no symbol>
gß^¹P‘|üß^! <no symbol>
gß^¹P‘|üß^! <no symbol>
gß^¹P‘|üß^! <no symbol>
gß^¹P‘|üß^! <no symbol>
gß^¹P‘|üß^! RegisterWaitForInputIdle + 73 bytes
I've hit it twice. Once in the F3 viewer looking at a model, and once going into a mod mission
that didn't have anything to do with that model.
Don't know nor am acquainted with error reporting.. but there it be if it helps.