Finder not responding after MacOS upgrade to Catalina 10.15.4

Safe Boot from the HD, (holding Shift key down at startup), does the problem occur in Safe Mode?

Safe mode attempts to repair Disks & clears lots of caches, so if Safe Mode works try again in regular boot.

I have the same problem with Finder not responding after installing iOS update this morning. Have rebooted several times in Safe Mode and regular mode. Didn’t help. Have followed protocol for reinstalling macOS from macOS Recovery - still hasn’t resolved issue, including trying Safe Mode start-up again after reinstall. What do I do next?

A further update to posting above. I cannot access any files from Word, Excel or PowerPoint, not can I save a new document, though the programs otherwise open and are functional. Also, Apple Mail doesn’t open. I’m having to rely on my iPhone at the moment. I can access my Files that are in iCloud from my phone.

Further update - as I sat in front of my computer 2 minutes ago, out of the blue the programs and files began to open. I’ve just rebooted and everything is back to normal. All problems resolved. Not sure what happened.

Any luck yet?

Well, OK, good luck. :)

Whew, great to hear!

Do you maybe have iCloud Drive enabled?