I have a brand new sharepoint online tenant. (actually I got the problem below, deleted the site collection and re-created it again). Im using csom (C#)
In the CA-->managed metadata I have created a TermSet with some Terms
In the site collection I programmatically created a Taxonomy Field, a content type, a list. I added the field to the CT and the CT to the list...the usual drill.
Now, everything looks fine until I try to create a new row (list item), in the GUI and assign a value to the Taxonomy field. I get the selection-dialog and can add my terms. BUT when I click Ok in the selection-dialog I get a script error saying
Line: 333 Error: Unable to get property 'set_returnValue' of undefined or null reference
This only happens in, yes you guessed it...IE11.