Problem selecting multiple files in Windows explorer

I'm using a new laptop running on Windows 10 64-bit. Since installing Office 2019 I have been having a few problems. The first problem is that I cannot select multiple Office files in Windows explorer. If I try, explorer freezes for about 15 seconds and then reverts back to only one file selected. The second problem is that sometimes after closing Word files, I see a message about recovering corrupted data from Normal (there's another message I've seen a couple of times as well, but I can't remember what it said, just that it didn't mean anything to me). This is usually followed by all my macros disappearing, but when I restart Word, they are all back again and working normally. At first I thought this might all have something to do with the solid state drive in my laptop, so I copied all the files onto my NAS, but the same behaviour occurred. Then I ran the check disc and check system files routines, but no errors were found. Hard Drive Sentinel also reports that my drive is in 100% perfect health. So I'm at a loss as to what might be the cause of all this. I did check and other files seem to behave normally in Windows explorer.

Disabling the shell extensions didn't make any difference. I haven't tried uninstalling yet as I didn't want to have to go through the hassle of re-registering and re-configuring everything. I guess I may have to try that though if I can't solve it any other way.