That's been happening for years and it's been reported before. I'm guessing HTC can't duplicate it.You can inadvertently change to the default skin by double clicking the aircraft selection but that doesn't change the fuel amount to 25%.
I don't remember ever hearing about it.HiTech
For example: http://bbs.hitechcreations.com/smf/index.php/topic,214485.msg2567933.html#msg2567933
That was a different report referring to exiting the program and was fixed.After a bunch of testing this one happens if you exit or change an arena and come back in with out exiting the game. Fixed for the next patch.HiTech