If you scroll down the left menu in the parts window do you find an icon of a magnifying glass somewhere? I've seen a case where it wasn't at the top of the screen as normal but the bottom (and needed to be dragged to the top). If that isn't it are you running Win10? It appears that one of the patches (that sometimes seems to fail on Win10) breaks search for reasons unknown. I think there were instructions on how to fix up Windows update so patches work correctly (which seems to fix the issue, although I've never seen it even on my Win10 machines).
Peter