Are you staking and mining? Cause you cant do both things.
Mining on 0.5.(1) works without problems.
Just you must have to have properly configurated miner.
Try to delete everything from %appdata%/slimcoin apart from wallet.dat and run again new wallet.
Yes, It has been working or seems to have been doing both just fine.
I may just have to run the wallet on 2 pc's one for mining and one for staking