I also haven't been able to get mining to work so far. When I start mining via the command generate 14 -1 the QT Wallet uses 1 Thread but that's it. Unfortunately from that moment the debug console doesn't react to other commands anymore. Also I haven't found any command to stop mining.
I also had the problem, that I didn't have an address and also couldn't create one via the GUI. I could create one via the debug console with the command getnewaddress label. I had to set the label as the new address didn't show up without one.
This is a new install of MegaCoin on Windows 10 64.
Edit:
I just got some MEC. So the mining part does work but it seems to be only single threaded.
If the wallet does mining then is nothing more possible.
Ok, if the mining is single threaded that's just the way it is.
But what about the part, that the debug console doesn't react to commands anymore and how can I stop mining?
You can only stop if all blocks created or you use "STGR + ALT + ENF".