I dont know if this will make it stake but you can try
I don't use .conf file and minting is working very well.
Right..Then I think his wallet is broken. The lock button should not be greyed out. Try downloading wallet again
Looks like your wallet is locked. Try to click on grayed unlock wallet. You'll need to enter password.
I don't think so. If the wallet is locked, the button should be black, not gray.
So, maybe wallet is not encrypted.