jep, i don't think that when the display says USB that it's actually charging, only when the red light is on and its plugged in, the battery is charging. When bat is full the red light goes out.
and for your filming problem, that could very well be the memory card.
for further help;
go into the GoPro HD cult,
go on facebook and become fan of GoPro,
(= lots of help and tips on their page, both from GoPro employees as owners !!)
Go to the GoPro help section and send them an e-mail with you're problem, they usually reply within 24h and are very helpfull !!!
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