To invoke the "Save as..." dialogue, I'm trying to use the Ctrl+Shift+S key combination, as is displayed in the menu. Every time I use the key combination, I see a tool displayed as two perpendicular red lines forming a corner. When I click and drag this across the document, it delineates a rectangle that disappears and causes the document to "flash" when the left mouse button is released. I realized that it might be acting as the snapshot tool, so I tried pasting into paint to confirm that is the case.
I'm using PDF-XChange Viewer 2.5, build 322.7 on Windows 10, with a "settings.dat" in the same folder as the executable to have settings saved there.
I apologize if this has been mentioned before, but the forum search seems to have no way to be forced to include the "s" in a search for "Ctrl+Shift+S" or the "as" in a search for "save as".
I also cannot find a list of hotkeys in the knowledge base or the support forum.
edit: for now, I'm using the sequential key combination "Alt" then "F" then "A", which I suppose works about as well as the simultaneous key combination.