Freeze during startup if magic trackpad not available

Down in SF last week and bought a magic trackpad and installed it. worked fine.
Got home and turned on my MBP; it froze during startup with only the finder window open, no dock, and not much else. mouse pointer couldn't click on things, etc. I tried restarting and restarting into my test (bare bones) account. No luck.
Then I wondered if the problem was that my new magic trackpad was there and turned on. That was the problem. As soon as I got the trackpad and turned it on, my system completed normal startup.
Anyone else have this experience. This seems like a bug.

Today I tried to replicate my problem and couldn't. Either by turning off the trackpad before I shut down or else while my computer was off.
So apparently my incident was an isolated one.

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