Check in and automatically remove files from Windchill workspace

We have upgraded to AE 6.1 and one of the new options available is when we check in an object, we can now choose to remove objects from the workspace. This new option is NOT working. We get the following message: [A11480] Attempt to implicitly declare variable "object_string" (at line 306 of file C:\Program Files\PTC\Arbortext Editor_61\adapters\com.ptc.prowt.arbortext\init\wcutil.acl"). The object is checked into Windchill, however, the objects remain in the workspace. I've tried setting a parameter in the userprefs.xml file.

Any other suggestions?