So, I went to work on my client's website this afternoon and realized that we could not drag and drop widgets over to the sidebar. I've found multiple other posts about this, but most are outdated. The one common solutions was the plugin "Use Google Libraries". I tried this to no avail.
If there are any new solutions, we would greatly appreciate it, as the site is not empty where my client had information earlier today. For some reason, he was able to delete them off, but not put them back on.