I've never had or heard of this problem before, but here goes.
I'm working on a brand new Mac Pro running FCP 7.0.3 over OSX 10.8.2.
Whenever I invoke the Import command, for instance to import a bunch of graphic into the Graphics bin, FCP opens a finder window (Choose a File: Final Cut Pro) and for some reason the Name column is always truncated, so I basically can't read the names of the files. If I widen the column, the change isn't persistent, so I have to resize the Name column constantly.
Finder windows work as expected when opened from Finder.