I have the exact same issue, I went into the Ebon Hawk on Dxun to change my party and I can't leave without getting a black screen. The game doesn't crash, it is still running, but the only thing visible is the cursor on a black screen.
I tried adjusting all the graphics settings and then leaving, since that what was what was suggested by drunklol above, before the OP said he fixed the problem, but to no avail.
I updated my graphics drivers as well, in hopes that would solve the problem. I'm using and AMD Raedon 6850, and I updated to the catalyst 14.2 drivers (available here http://www.amd.com/en-us/products/graphics/desktop/6000/6850). This had the unfortunate side effect of causing my game to crash upon loading and of the save files, but this was easily remedied by disabling the frame buffer effects option under the advanced graphics settings. The original issue still remains however.