Despite what you say about your INI file, I would recommend trying the following:
Close LabVIEW, rename your LabVIEW.ini file in the LabVIEW directory (typically C:\Program Files\National Instruments\LabVIEW 8.2) and launch LabVIEW again. Does the problem persist?
If so, a file on disk may have become corrupted, in which case a repair or re-install may be the most reasonable solution. However that's more time consuming than if it's just an issue with the INI file, so I'd try the INI first.