upgrading fixture library on existing show

How do I upgrade the library file in an existing show file. I can't seem to get some fixtures into a show that is 4.0.60. Everytime I goto merge, I get an error about Merge Failed: invalid exception?

Any ideas? I'd prefer not to have to rebuild the show ...

Oh, and I leave the merge screen, and the desktop crashes. And, the console doesn't shut off (with the power switch or pulling the plug) -- still sitting here with the X on the screen. Pig open backspace does nothing (as it usually doesn't when it crashes for me) -- Any idea how to HARD reset? I had this happen a few weeks back too.
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