So Aperture 3 keeps proving itself to be the worst piece of Apple software I have ever laid hands on.... It now will not even open. Here's what happened: I was working on touching up an event I just shot and was cloning something. Aperture was not ok with this and was incrementally updating the clone brush strokes I was making, so I hit command Z to try to just undo the command. This completely froze aperture so I force quit and re opened it, only to find aperture immediately trying to complete the clone I had tried, immediately freezing and quitting itself with an error message. I restart my computer and opened aperture again, and it starting trying to do the clone again and quit immediately, probably 2 seconds after opening. What the heck can I do to fix this????? EDIT: Here is the crashed thread from the crash report: "Thread 23 Crashed: 0 com.apple.QuartzCore 0x0000000101e618ae fe_kernel_get_n_params + 4 1 com.apple.QuartzCore 0x0000000101e6176d -[CIKernel apply:toptions:] + 76 2 com.apple.QuartzCore 0x0000000101e6171f -[CIFilter apply:] + 214 3 com.apple.QuartzCore 0x0000000101f449a0 -[CIGaussianBlur outputImageV1:] + 3800 4 com.apple.Foundation 0x00000001049913d1 -[NSObject(NSKeyValueCoding) valueForKey:] + 420 5 com.apple.QuartzCore 0x0000000101e5db94 -[CIFilter valueForKey:] + 39 6 com.apple.QuartzCore 0x0000000101ebe5b6 -[CIGaussianBlur(CICheckFixForAperture) valueForKey:] + 139 7 com.apple.geode 0x00000001015cd2d0 -[DGDefinitionFilter outputImage] + 450 8 com.apple.Foundation 0x00000001049913d1 -[NSObject(NSKeyValueCoding) valueForKey:] + 420 9 com.apple.QuartzCore 0x0000000101e5db94 -[CIFilter valueForKey:] + 39 10 com.apple.Aperture 0x00000001006f1177 0x100000000 + 7278967 11 com.apple.geode 0x00000001015a9d25 -[DGDescription processImage:format:masterSizeroxySize:dough:inputColorSpace:workingColorSpaceutputColorSpace:rawDictionary:sessionRenderType:showMaskMode:showMaskOperationIndex:applyGeometryToMaster:acceleratedHistogram:] + 7057 12 com.apple.geode 0x000000010159d196 -[DGRenderFactory renderRequest:intoPageRef:] + 3195 13 com.apple.geode 0x000000010159c148 -[DGRenderFactory renderHandler:] + 175 14 com.apple.proxtcore 0x00000001014925e7 -[XTDistributor distributeMessage:] + 439 15 com.apple.proxtcore 0x000000010148d350 -[XTThread handleMessage:] + 160 16 com.apple.proxtcore 0x000000010148b759 -[XTThread run:] + 377 17 com.apple.Foundation 0x0000000104985e8d __NSThread__main__ + 1429 18 libSystem.B.dylib 0x00000001036a9456 _pthread_start + 331 19 libSystem.B.dylib 0x00000001036a9309 thread_start + 13" If that helps.