Lookup control on change is no longer working

I use Plumsail lookup controls in many forms. They have been working fine for at least six months. Today, I cannot even get them to say "Hello".

fd.control('lookup').$on('change', function() {

Did something change in Plumsail? I remember it upgrading to the newest version Friday.
If something changed in SharePoint, what would I look for?

I found the answer. The "Save to" option must have a value. This was not necessary before.


Dear @tnewton,
Hmm, seems it was the case after the update, please, try clearing browser's cache or use Incognito mode - a fix for this issue has just been released.