I have exactly the same problem as Scott.
Thanks, Scott, for hinting at WP Rollback.
PS:
I discovered the problem when using wp-cli to update a test website including all plugins and themes. Right after updating svg-support the error occured with each and every operation that involved using core functionality. I couldn’t even uninstall svg-support using wp-cli; I had to remove the directory ~/wp-content/plugins/svg-support manually to be able to continue.
wp plugin install –version=2.4.2 svg-support
wp plugin auto-updates disable svg-support
reverted to the previous version and disabled auto-updates for now.
I hope the next update of svg-support fixes the problem.
Regards
Andreas
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This reply was modified 2 years ago by Andreas. Reason: additional remarks, wp-cli commands used