Probably nicehash changed ports/settings for some reason. I will check it and change ports in next update, it will be available in 2-3 days.
Just noticed about a problem in linux, don't know if was already mentioned, but need to be fixed asap.
I'm getting this error continually and is filling really fast my log folder in /var/log/kern.log specially, also some in syslog
Fixed, will be included in next update.