I get this error when trying to fill out the taxonomy form:

An error occurred.
http://dsmdat.mork.esource.com/batax/autocomplete/4
{ "Architects/engineers/designers:11": "Architects/engineers/designers:11", "Architects/engineers/designers:801": "Architects/engineers/designers:801", "Building owners/operators:10": "Building owners/operators:10", "Contractors/builders:9": "Contractors/builders:9", "Educators/students:7": "Educators/students:7", "Energy service companies:5": "Energy service companies:5", "Manufacturers:3": "Manufacturers:3", "Nonprofit organizations:2": "Nonprofit organizations:2", "Nonprofit organizations:797": "Nonprofit organizations:797", "Retailers:1": "Retailers:1" }<div class="dev-timer"> Page execution time was 298.87 ms. </div><div class="dev-memory-usage"><h3>Memory usage:</h3> Memory used at: devel_init()=<strong>2.04</strong> MB, devel_shutdown()=<strong>25.22</strong> MB.</div>

This happens regardless of whether or not multiple select or starts with/contained is checked.

Any thoughts?