Updated to RapidWeaver 7.21. Also updated Stacks plugin and 3 former Loghound Plugins that are now part of Your Head (FAQMaker, Site Map and PlusKit). Checked to see all stacks are updated to current version.
Now when I attempt to export or publish the site, it crashes before the export is finished.
It’s been a while since I’ve opened the site, but there have been no content changes (other than changing the year in the footer from 2016 to 2017).