Hmm everything showing up big is some issue with the scale info from mod.ini (which I haven't been able to reproduce but already changed something that might fix it for next version). I'm really not sure how that could relate to deleting that png file. I also have no idea why deleting the bmp one makes it work, since it should have been completely ignored in the first place... Anyway, everything happening to you seems so weird but if it works, it works xD