I tried the same thing with castleflags.bif, attempting to add a 21st flag for a new faction in order to investigate the problems spmetla was having with his newly discovered FN_FREE_xx factions.

I downloaded the newer Shogun 2.1 editor, split all the frames into 20 BMP's, copied one, edited it, then re-built all 21 BMP's into a 21 frame BIF again. Unfortunately all the colours then changed slightly -appeared to have acquired a 'washed out' tint to them!

Ok, tried it again (just in case I'd cocked up) but the same thing happended.

Hhmmm ... I seem to remember that you, LK, recommended 2.1 to me! Any clues ?