RSVP i would not recommend you to totally rely on the posts in an internet forum... but as an international student myself, you should know that you should make your international advisor sign your I-20 before you leave the country. as for reapplying for a visa, that depends on when your visa expires. if it expries this summer then you should obivously reapply, but if you visa extends until u finsih your graduation, then i don't think you need to reapply again, since your visa is already valid till december (or whenever). no matter waht, you must still talk to your international advisor or a school official.