Hi,
Thanks for responding. I did get the frozen preference window pane to work by doing this:
Finder>Go>Go to Folder, copy & Paste:
~/Library/Containers/com.apple.mail
Highlight all the contents.
Then right-click and choose "New Folder with Selection”. Do not move the new folder from this current location.
You can close the Finder window.
The next step will be to restart the Mac and test
BUT.. I can't use default on my signature page because I had about 50 different quotes / signatures and the page is long and there is no way to shorten the page (no slide bar on the side) to get to the button for default. Can you help on this?
Also, I like Classic format for incoming mail and I have not been able to change the font with some space between the messages. Also, not being able to move the columns is not a good change.