Every time I switch from Superstar to All-Star difficulty in MyCareer ALL the VC I got from the previous game vanishes!
I wasn't sure what the cause of it was until just now. 1,300 VC GONE! Just because I wanted to make sure that I wasn't playing on Superstar after my CPU teammates give up 60% shooting to the other team.
I think it resets my endorsement salaries too. I only got 1 games worth of salary. Not sure about that, but I know it took all my gameday earnings for a fact.