Yes I see this too on both the 6700 and 6600 running SmartSDR 3.1.8 directly I don't remember 2.49 doing this and haven't checked over SmartLink. I've tried several computers and all are the same, If you watch the waterfall and listen to the Audio it is weird to watch and listen with the Audio Latency being .5 sec slower then the Panadapter.
I ran the same issue up the pole a month or so ago. Was told it is a problem that the software people are, reportedly, working on. Haven't heard anything so far. Maybe a fix will be in the next software? In the interim, the monitor stays off...besides bands are horrible out here so it's only CW/FT#, hi hi. Aloha, AH6FC Bill