Yes, there is a known issue with the scaling of tab controls with the window size. This will be fixed in the next release of LabVIEW. For now there is a workaround that might help:
Only scale the tab control as the panel resizes. Leave the "Scale all Objects on front panel as the window resizes" unchecked. Select the tab-control and go to edit->Scale Object with panel. This will not scale the objects within the pages.
In general please refer to
this document for further information about misplacements that may occurr with the rescale option.
Best regards,
Jochen Klier
National Instruments Germany