Hi Wil,
I opened your Tab Control VI in LabVIEW 6.1 and LabVIEW 7.0.
In LabVIEW 6.1, the tab control did show up in the weird way you described. However, in LabVIEW 7.0, the tab control looked normal. It could possibly be an unexpected behavior in LabVIEW 6.1 that was fixed in LabVIEW 7.0.
Download the evaluation version of LabVIEW 7.0 and give it a shot. http://ni.com/labview
Sincerely,
Feroz
National Instruments