Sudden issues with combining files and PDF opening in random window sizes

Out of the blue, I am having issues with opening and combining files. 

Almost every time I try to combine files (from File Explorer on Windows 10), I have to select "combine" twice. Sometimes, I get the "raise without handler!" error, but most of the time it just doesn't take the action and I have to right click and select combine again. 

The other issue is all of a sudden, PDFs have started to open up in random sized windows vs full-size (not full-screen) as they always used to. I find myself needing to manually resize every single PDF that I'm opening up now, including when I'm trying to combine files. 

I'm losing patience with this, and I have been looking into this every day for weeks now with no changes. I have uninstalled and reinstalled the program. 

Is this just my life now? Why would this randomly start happening?