I have Adobe Reader X [version 10.0.0] and when I open a PDF, I cannot zoom with keypresses
until I have caused the application to show any set of menu options [eg click 'File' menu with mouse, press alt+f to show file menu etc.]
Any idea why?
Is this fixed in a newer version (I have no authority to install and test myself)
I do not know if this is something that was wrong in 10.0.0; I just tested it on 10.1.3 (without menu bar / tool bar), and it works fine.
P.S. you can toggle the menu and tool bars using F9 and F8.
Based on your answer I had 10.1.3 installed for me and the problem has gone - I assume an issue with 10.0.0.