Drugar,
The Queue VIs were completely rewritten for LabVIEW 6.1, however, the changes should be seamless unless there are CINs involved. If these were compiled with 6i, then try compiling them with 6.1. If you are still having issues, then please submit a service request by e-mail or phone at http://www.ni.com/ask.
Randy Hoskin
Applications Engineer
National Instruments
http://www.ni.com/ask