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Do you happen to be playing with the USA? There was, IIRC (maybe still is, I'm using Exel's sprite pack so I can't tell), a problem with the USA and fighter sprites. Because the USA is set to use it's own sprites in country.csv and there isn't a USA L-1 fighter sprite, the game defaults to the MIN fighter. But then, it never gets around to switching to either the MIN L-2 sprite or the USA L-2 sprite.

I think it's general to all countries that have their own sprites and lack an L-1 fighter sprite, but the USA is the most usual offender.
 
Any of this your situation Heretic?
 
OK, thanks for the tips..

Zuck..etc..
Yep, the issue uis that when I upgrade them, the graphic stays put

Gwalcmai..
Yes, I had this issue with the US, and also with Brazil.. I shall quickly try some other nations too just to check.

Castellon,
yes, this does seem to be my situation..
But..

What do I do to fix it?
Thanks.

Heretic
 
I am not up on the software bug, I only handle the hardware stuff.
The answer apears to be adding the files in or if you do not feel comfortable with that, then install a graphics mod like the one Gwalcmai suggested.
You could check through the bug forum for further info, or ask for suggestions in the editing/mod forum.