I have an OPT valid till 07/14/07 and my employer recently applied my H1( premium Processing ) starting 11/01/06. Remember my H1 starts from 11/01/06 so my status will be changed to h1 as of 11/01/06. So until that day i can work with my OPT. So if i travel and come back on Oct 06, will there be a problem?