UPDATE: After the restart, I got stuck again on a fork. The giveaway was that the first block was taking forever (or so it seemed) to be processed. This morning, I figured I was on a fork, so I restarted again. This time, after starting 500 blocks later than the first time, the blocks were processed rapidly. Interestingly, my client went back 500 blocks to the previous restart's beginning point. Nonetheless, it rapidly moved forward to the current block. I just verified that I'm on the current block. In the meantime, my magnitude increased and I received a large PoR reward. :-)