The automatic up/down feature of the front windows is based on something like a circuit breaker that stops the motor when a certain amount of resistance is met. This "breaker" is also tripped sometimes when the window first starts moving. Try starting the window up without pulling/pushing the switch past the auto-detent (the slight click you feel when it goes to auto up or auto down) - then push/pull it all the way. Should work fine.
If it ever does stall on you, wait a second then try again. The system should reset itself almost instantaneously.
If it ever does stall on you, wait a second then try again. The system should reset itself almost instantaneously.