In LabVIEW 6.0.1 the body of a tab control disappears (only tabs remain visible), when the VI is run with all options selected in Window sizes property.
I had exaclty the same problem!!! And the funny thing is that it is not systematic but accidental. I believe this is a bug of LV 6.0.1 and I don't know if it was fixed in 6.0.2 (the documentation doesn't mention it).
This issue isn't fixed in 6.0.2, but we are aware of the problem. The issue is with the Scale all objects ... functionality. You can see this by only checking that option and then rescaling the window.
Marcus Monroe Applications Engineer National Instruments