I copied my iPhoto '11 library (310GB) onto an erased internal drive for better speed (getting too many iPhoto crashes when importing with library on a network server, and it takes hours and hours). But after working a couple times another import crashed, and a Time Machine backup had started. I stopped the backup, but iPhoto launches with this message: "iPhoto will open as soon as the iPhoto library is available Time Machine might be backing it up." So I re-enabled Time Machine and let the backup run to completion, figuring stopping it must have left it locked, and a normal completion would unlock it. No luck. I'm completely frozen out of this library because I always get this error message, and there's no reason the library should be locked. How can I unlock it???