I should probably post about this, as it's something I noticed. It doesn't really affect me, but it would be useful if I let you guys know.
Some controls have problems on Windows 8 when "Right-handed" is enabled under Tablet PC Settings in Control Panel. This setting causes menus to appear on the left side instead of the right. The reason why this is a probably going to become a bigger problem is that Windows 8 is pushing touch screens, and I've recently had a bunch of new Dell's come in, all with touchscreens--they all have "Right-handed" settings enabled by default.
The contol I noticed with the problem is the "Mini-ToolBar" part of the Ribbon suite. If you open any of the ComboBoxes, the mini-toolbar position jumps far away from the cursor, instead of staying in place. This happens when you right click and attempt to use the toolbar, but not when you highlight text and use the toolbar.
I believe I spotted some other issues, but I don't remember where. I turned this off pretty fast, because menus on the left hand are really annoying, but anyway, I hope this helps.