Since then ? I know there is some issue with this when windows changes time (pulls from NTP or user changes clock) - this happens rarely, but other than it should work fine. I will check it.
This thing is for sure, SRB says "1" minute regardless of what setting it is, it may think more / less minutes have passed if there was a clock change (my clock seems fine though), but it specifically says 1 minute still.
Have you tried with 1 's' (--maxnosharesent , not --maxnosharessent like you wrote). Also it's not set in minutes, you set it in seconds.