Most likely cookie-related. If some people can login try having the people with problems clear all cookies and try again. If this doesn't resolve there issue in the initial download for vB there's a utilities (or tools, can't remember) directory. Follow the instructions for installing that stuff then use that utility to reset your cookie settings.
Out of curiosity, in your admin CP what are your Session Timeout /
Path to Save Cookies / Cookie Domain settings?
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