Acrobat DC - doesn't see ANY network drives!

Acrobat DC 15.017.20053, latest version available. Windows 7 Pro 64.

Acrobat DC doesn't see ANY of the drives on my network! I don't use this program very much any more, but from time to time I need to run it. I tried to retrieve a folder of PDFs from a network drive and - but there are NO drives visible when I click on the Network!

Dreamweaver, Photoshop, Illustrator, InDesign etc etc etc have no problem with this. I vaguely recall that there is some sort of odd "Protected Mode" for Acrobat  out there, but a little Googling around showed no useful info of recent vintage.

Is there a setting somewhere in Acrobat's more or less indeciperable user interface that I've missed?

TIA!