Noob Question On Acekard 2i

I just updated my Acekard 2i to 1.8.6a and I'm just wondering, what does the yellow colour mean when you start up a rom and it says 'loading' (which changes colour depending on the rom)? I had 1.6 before and the colour changes to green but now it changes to yellow instead. Is yellow the new green (in this case) of does yellow mean anything specific?

I think I remember seeing somewhere that the color changes depending on the save file type....not sure though, mine has always been yellow.

The save file had the extension '.sav' and it was for Pokemon White US Version.