Okay so I'm not entirely sure who's fault this is, Classic Shell or DisplayFusion, but here's the bug.

In Classic Menu I have this option turned on. http://i.imgur.com/MQxuh9j.png

So that right clicking the Start Button brings up this menu. http://i.imgur.com/lBs5LPq.png

When I right click the Start Button on my second monitor, it brings up the menu but my cursor is teleported to the top left of my primary monitor instead of down by the newly opened menu on my second monitor.

Display Fusion has an option to move the menu that appears pressing Win +X to the location of the mouse, most likely the 2 features are interfering with each other.

The option is located in the Windows tab in the Display Fusion options, third option from the top. Check what happens if you disable it.

If this is what you are referring to, then it was already disabled, still happens.

I guess you meant to include an image in your post? Because I don't see any..

Woops. http://i.imgur.com/24MVD2e.png

Yes, that's indeed the setting I was talking about. You have already it disabled though.. my suggestion would be to temporarily uninstall DF (either uninstall keeping your settings or backup them and re-import them on re-install) and see if the same still happens with DF removed.

If the same thing happens with DF out of the way clearly something else is going on, if it doesn't happen anymore you can re-install DF enabling logging. The logs might help the developers to track down the issue.

Well it's definitely a DF issue, because closing DF then just enabling Windows own Taskbar, right clicking the button works without a hitch, enabling DF again and the cursor jumps again. http://i.imgur.com/OtP2LpO.png

Thanks for looking into this and showing that I'm not crazy!

It must be a specific issue with Win 10 then, I can't reproduce it with Win 8.1.

This has been fixed in Beta 9, Thanks!