blank pop-up window freezes application
In the last couple of days, whenever I try to use Adobe Acrobat Reader DC (version 19.012.20040) on my Macbook Air (MacOS Catalina, version 10.15.2), I've suddenly started getting a blank pop-up window appearing on top of the main Adobe window. Once the pop-up window appears (2-3 seconds after the application is launched), the application is frozen, the window can't be closed, and the only way to escape is to force-quit the application. This happens whether I try to open a specific document (any of several) or just launch the application itself, no specific document. My pdf files open fine in Mac Preview. Any ideas of what's going on, or how to solve it?
