I cant reproduce any issues with your settings file. However, make sure the tags tool plugin doesnt have any rules that would reset the playcount. But its more likely the problem is related to syncing the play count with last.fm. You could force a reset by renaming LastFmPlayCountCache.dat to another name so MB redownloads all the play counts from last.fm. Its located in the appdata folder (help/ support/ open appdata folder)