What is your blockchain height? It must be > 20295.
20300
In client, go help > debug window > console and type listtransactions. Did you get an orphaned blocks?
Nope, even tried the wallet encryption trick, nothing,

Sorry man, maybe your luck isn't good? Probability and dispersion can make such unlucky situation.
You can ask dev for how minting is made.
Possible reasons:
1. Network, firewall, ports.
2. Weak CPU can't find hashes quickly in planned timeframe.
3. Insufficient luck points.
Edit: Congrats, mate! Patience is good enough.