Cannot uninstall plugins or delete users

Having trouble with several features now, including the one mentioned by another user about deleting users. Roll over function works, but function does not. Also, see screen shot. This is what the plugin screen looks like, with the overlapping boxes and I cannot successful uninstall the plugins to see if that might fix things. Are these problems associated with the upgrade? And, if so, can I fix it by going back to the older version?

The “overlapping” you’re seeing in that screenshot should be solved by a hard refresh or clearing your browser cache.