I've been having the same issue with speed limiter with newsbin since I bought the program in 2013, it has never worked.
It reverts to full speed within a minute of turning it on. There are older posts I've searched and read about this issue. There seem to be some work arounds that say you need to limit it below 20Mbps for it to work ... but for me at any speed it reverts. I do not have the time-out on, but I've tried that as well and it doesn't help. I'm currently on 6.73 build 4821.
I've also read that one solution is to limit your connections, but sometimes I want full speed and sometimes I wanted limited speed, and the speed limiter button is a quick and easy way to accomplish that, instead of editing my configuration each time depending on the speed I want.
Is there a reason or fix for this that anyone is aware of?
Thanks.