(Let me beat arturo to it
- Hmm, tossing your cookies every night? Hasn't happened to me. Do you also have a craving for pickles and ice cream?
Seriously, though - you might want to check the settings on your browser to see whether they have corrupted (or been changed) to no longer allow your cookies to remain "set" after you close the session. Some browsers offer that option.
Just a thought.