Can FCPX work with vector graphics?
Here is a workaround I've discovered that seems to work ok. It's not elegant, but it gives you vector support within FCPX, which can be handy in a number of situations. It does require Apple Motion, however.


Convert your vector file into a PDF using Preview.
Create a Final Cut Generator in Apple Motion
Import PDF
Click the PDF in the "Media" pane (next to the Viewer), then in the inspector, un-click "Fixed Resolution" in the "Media" tab.
Drag the file into your composition.
Save As...


This will create a generator in FCPX, which is a little more permanent than making a simple file. But if you're doing work for a client and want a persistent vector version of their logo or something, this can be very helpful.