🚀 go-pugleaf

I have the exactly the same problem, on two different PCs!

The menu bar changes it's size or position or disappears altogether (taking the window frame with it) if you move the mouse over it. Sometimes it appears blank, and you need to move the mouse over the menu items (File, Edit, etc.) for them to pop into view. Other times there is a large empty area below the menu bar, about 3 or 4 times as thick. This also pushes the status bar, horizontal scroll bar, and the bottom of the document out of view, since window size calculations don't seem to take it into account.

This doesn't happen when PDF files are opened in the internet explorer plug in, nor when you hide the menu bar.

In fact, a work-around to the problem is to press F9 twice in quick sucession - to hide then show the menu bar. It then appears correctly. It will screw up again only if you move the mouse outside the adobe reader document area (e.g. onto the desktop, or onto the window frame) and then back into the document; often you'll have to move the mouse onto the menu bar itself for the problem to recur.
If you maximize the Adobe Reader window and avoid moving the mouse to the top of the screen, then the problem won't bother you.

Clearly this is a serious bug in Adobe Reader!!!