Hi. After looking at another thread, I enabled WP_DEBUG and set it to write to an error log file in site root. Nothing is showing up there.
I don't see any javascript errors.
I have tried assorted things and finally got it to throw an error:
Fatal error: Call to undefined function zip_open() in /home/debgoodwinarts/public_html/wp-content/plugins/types/library/toolset/types/includes/import-export.php on line 166
So, I have a support ticket in with my host. We recently made some changes to enable php7 on a per-account basis, and I think we lost a library or something; this particular account is using the default php 5.6. I'll update this ticket once I'm done addressing the server issue. With luck, that will take care of everything. Thanks.