This confuses me. I left my computer mining all night, and in addition to the balance and unconfirmed, I have a place for
Immature: 150 PTS
However, when I go to the transactions tab, there are two entries with 50 PTS each of type Mined. They aren't confirmed and have a "?" to the left end. When I hover, it says 'Offline 3 confirmations. This block was not received by any other nodes and will probably not be accepted!'
What exactly does this mean? I don't suppose there was any forking, was there?