Hello Phillip,
There's a few quick troubleshooting steps you can do:
- Check and see if you're including jQuery Migrate. If so, in your layout.master there will be a line like this:
<portal:ScriptLoader id="ScriptLoader1" runat="server" IncludeJQueryMigrate="true" />
Keep in mind there are probably going to be other tags on the ScriptLoader as well, but that one in particular can fix some compatibility issues if you enable it.
- Check if you're getting JavaScript errors in the console, and paste those script errors here. We can't very easily help you diagnose a script error without knowing what it is.
If you're not sure how to look for script errors, you could also paste the URL here (provided it's a public site), and I'll take a look at it.
Hope this helps,
-Isaac