.odt files won't open

I’ve ben using LibreOffice 5.4 on Windows10 for a few months and have
dozens of .pdf and .odt files. All of a sudden, I cannot open the .odt files …

help! I can find no information anywhere

How are you trying to open the files and what happens when you do that?

I have the same problem. I click on the shortcut or on the actual file, and there is a delay with the hourglass showing, then nothing.