Multiport is pointing to NVC, and does not appear to be properly accepting shares.
My "utility" was less than 1/3rd of normal, and a glance at cgminer log showed just a handful of accepted shares over a 5min span.
Now set to LTC port and mining directly, seems to be working normally.
I have this exact issue as well. Switching pools solves this issue. I don't think this is typical of NVC, so I'm confused as to what happened to the pool that it is giving us these issues.