Thank you so much! I have been battling with a similar problem for a couple of weeks now.
Running windows 10 and office 2013 (both 64 bit) on an Acer laptop. Any drop down filters in Excel autofilter or Pivot tables (as well as right click context menus in PowerPoint) would open for a short while then disappear before a selection could be made.
I tried new mice (Both wired and wireless), changed usb ports, swapped from HDMI cable to standard VGA, ran sfc /scannow and NOTHING worked. I even moved the files from a network share to the local Hard drive with the same results.
Tried opening the same files on another PC, and they worked fine.
Then I came across this thread. As I had tried everything else, I thought what harm could it do? I was just about to do a clean reinstall of my laptop.
I searched for .edx files and found four. Deleted them all and rebooted. Problem has gone away. I will continue to monitor and see if it comes back, but so far so good.
I checked on the other PC that ran fine, and there were no .edx files present.
Once again, thank you!☺