Volume level in my mix

[HCMarkus]

If you have the fader for the channel/master with the Limiter instantiated riding above 0 and you have the Limiter increasing gain to 0, you will see overs.

[Tritonemusic]

I was using the MW Limiter the other day to try and bring up the level of one of my mixes, and despite the fact that I had set everything exactly according to what the manual suggests for moderate limiting on an overall mix, it was still peaking out. I had to pull back the master fader to something like -.9 db or so to get it to stop the clipping.

has anyone else run across this issue? I've seen it once before, but I've used it numerous times previously with no problems. what could be causing this?

Really shouldn't happen. In fact, I'd say it is impossible.

If the Limiter is set to 0db or - whatever - then it won't go above 0.

It can exceed -0.00 if Dither is enabled. Dither will add gain after the Limiter.