I also had the problem again and want to thank Esmi. Though everything worked great for about a day, experiencing trouble and don’t know what I might have done to cause it.
Currently, the front end of site is still displaying fine, though I am unable to access the dashboard or anything else on the backend with getting the following error:
Fatal error: Cannot redeclare class WP_Theme in [….] /wp-includes/class-wp-theme.php on line 9
I’ve tried deleting the file and uploading versions from recent downloads, but to no effect.
Any help would be appreciated.