The STEEM network just hardforked, so make sure you update your software if you are mining for STEEM and are still on the old software in order to continue mining without any problems. Do note that one of the things the new release fixes is an issue discovered with mining that was misused by a single user recently to overtake the miner-witness queue.
If you are interested in trying to mine STEEM, then you might take a look at the guide I have recently written on how you can get it up and running in no time: Getting Started Mining Steem on Windows
Do note that by mining for STEEM you are going to be rewarded with STEEM POWER!
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