Multiple Finder and Quick Look issues after macOS 15.8.0 update

This MacOS 15.8.0 has been a disaster for me. :-( Over the years I have been lucky and with point releases I have never had any problems, but that lucky streak has ended. M2 Pro 12/19 16" MBP 32gb/1tb.

These are some of the problems that started with 15.8.0 for me:

• In Finder when I select the icon view I no longer get thumbnails for my JPEGs, etc. Just a generic icon.
• If I select a photo file (JPEG, TIFF, raw) and hit the spacebar it no longer will show the photo, just shows a blank white window. It still works for txt and rtf files.
• Sometimes when I select a file (nothing big, just a small file such as 100kb) to delete (Move to Trash) it will hang and a tiny window will come up. I don't recall the message.
• It also happens when I select and copy some files (cmd-c) and then in a different folder I move them (cmd-opt-v). It hangs for many minutes with a tiny window saying it is preparing it. I do this several times a day for years and it is always instant until now. In all cases just on my internal SSD.
• Whenever I plug an SD card in to copy photos I cannot eject as normal. I must do a force eject.
• I have also noticed when embedding a photo in an email using gmail (website) it sometimes hangs for a long time. I see that Safari was also updated to 27.0.

This is horrible. On multiple other forums on the internet many people are having these problems with 15.8.0.