It might be misreading your "null" as a negative number - epoch time is measured as the number of seconds from 1.1.1970 IIRC, and a lot of time values are stored in the database in epoch time values. I'd check the code but I'M ON VACATION! so maybe Aaron'll get bored later today and tell you.
CRZ: Any thoughts on making this change permanent? Meaning adding it to an color scheme that you can choose along with the classic color in CP? This might be blastphemy but I like this better than anything, and I am using IE.