I installed Windows 7 Beta on my MBP yesterday and for a while it showed up in my Startup Disk options in System Preferences, but now it doesn't show up. The partition is still there in Finder and I can boot to it each time by holding down the option key, but if I restart more than once in Windows 7, it defaults back to OS X. Is there a way to put the disk back into the Startup Disk options?