Engine supports PNG images. If you provided it with JPG (though the editor wouldn't even allow it) it won't work.
I must not be very good at this because I keep corrupting my projects, but all I'm doing at the time is rescaling the hud sprites. I have an error log, where would I send it?
You can send a pastebin here.
However you need to make sure you have proper names. Or just reimport HUD sprites through the editor
