I have Inventor 2013 and I have noticed a slight bug or glitch when I right-click. Occasionally I right-click on an item and the cursor disappears. I can select things and highlight them but I'm "feeling" for what I'm trying to click on. Once I click out of the right-click menu everything is back to normal. I have a Quadro 4000 video card with the latest updates.
I've seen it a lot. Many combinations of computers/graphics cards/drivers etc. Still haven't found a solution other than to turn off the marking menu (reverting to classic) and then turning it back on. Most people just work with it - but I'd love to know the cause solution so I'll be watching this thread! (Sorry - I don't often post on this DG without an answer, I just wanted you to know you're not alone!)