Would anyone be able to explain something for me.

I upgraded to 4.6 today I believe, I am unsure how to check it worked, as in the units GUI it still shows 3.12 or something.
I also installed the M's Ant Monitor.
After both tasks were done, the R-Box on my laptop (where I installed everything from and to), and my Ant S3 both were hashing, but not for me. They showed 0 Gh on Slush for past 5 + hours, then I re-entered my pool settings and applied and they started hashing for me again. My Norton sees the M's Ant Miner as a virus.
But after all that, my speeds are OK average as usual, but last few blocks since they have been running again, my earnings per block have dropped substantially from about 0.002 to about 0.0015 that's a 25% drop off in earnings per block.
Any Idea what has caused this?
Can someone give me specifics on how to revert to undo the changes? I am very unskilled at changes and needed to find the right post to understand or at least copy how to upgrade. So I would need some pretty specific info to revert back as well.

Thanks for your time in advance. This dropoff is a game killer for me to have that much less earnings.