How long is the sequence, how large are the images and how much RAM do you have?
Not only am I having Maya problems, but this whole internet forum thing is blowing my mind as well. Methinks the iPhone and posting here aren't getting along.
At any rate, I have a 200 frame sequence at 640x480. Running Maya 2010 30-day trial on a Mac with OS 10.5.9 and 4GB RAM.