Did mining difficulty or anything else changed after the fork? I haven't been able to check my miner rig for a few days, and now I see that it didn't hit the block for an unusually long time. I wonder if this has anything to do with the hard fork...
The only change to mining was to change the PoW reward and enforce a MN reward with each block. You may need to double check that you're on the latest version of the wallet v1.2.0, older versions probably won't find any PoW blocks.