It looks like a VI with a front panel of 0 pixels.
These are automatically generated by LV if you use auto-center (from the VI-properties) and then close programmatically the Front Panel (8.0 bug)
The reason it shows up on your PC and not others....
Maybe it is a vi.lib or user.lib file that you closed programmtically. To resolve this you have to find out which VI it is, and than edit the properties (or reset the FP)
Good luck,
Ton