i hate when that happens!
while the belt is retracted all the way, fold an edge of it over and keep it there while you slowly pull the belt out. make sure as you pull it out you keep a good grip on the fold and try to pull it across while you pull the belt out. that's the only way i know how to flip it over. if you can't pull the belt out at all, i don't know what to tell ya. keep tuggin i guess. lol