I'm using virtual box 5.0.14 and I've installing guest additions and the extension pack. I am able to scroll up/down however frequently as I'm scrolling down it scrolls up instead. If I disable mouse integration the problem stops however the mouse pointer does not feel very smooth compared to using mouse integration. Any idea what the problem could be?
I had the same problem. It seems it is a Virtual Box. I found this Virtual Box forum post:
Fixed this issue, I ejected the guest.iso and inserted it again and it resolved the mouse scrolling issue.
I followed the suggested decision and it helped. So eject guest additions, insert again and reinstall.