There was a fork at block 615000 that changed difficulty retargeting, so patch 5 will no longer work. In addition to that when the fork occurred the retargeting did not work correctly for PoW, so mining is not currently working. The chain is moving on PoS right now and will continue to only be PoS until the dev releases a wallet update that fixes the PoW issue.
Yup, finally a definitive answer; thanks ctgiant!
This solved my problem.OP of this thread should be fixed with link to proper (current) wallet though... (why is link to obsolete wallet still there?)
I must say, the new PC wallet looks quite good; good job CryptoCoderz!