The last Windows QT isn't working for me either. I tried everything but it is always showing "hashespermin" : "No information yet. Wait at least 4 minutes after starting mining for estimate." even after some hours. We need another version.
Same here. also if you check your CPU usage it does not differ from usual when it should be close to 100% when mining. my normal usage when some programs are running is around 23% and when "mining" with wallet qt it only adds maximum on 0.1%.