Wrong image preview while I am moving adjustment sliders in Aperture
When I move adjustment sliders, a different recently and previosly adjusted image will frequently show in the viewer while the slider is being moved. Sometimes parts of two or more previous images will appear and sometimes in the wrong orientation. This makes it makes it impossible to see the result of the adjustment until I release the slider which is annoying. I cannot reliably replicate the problem but it happens often. It seems random as if the wrong image is in a cache and not refreshing properly.
Details:
MacPro (New) 6-core 32GB RAM, D300 Graphics OS X
Aperture 3.5.1
Moved Library from old machine (2007 MacPro) and rebuilt library
250K images all referenced
Library is big (236GB)
Files are RAW Canon 5dMk3 and tend to be about 30MB
Preferences:
Import: standard previews
Previews: generate automatically and share when quitting (half size medium quality)
library created new previews for all images when I rebuilt it
machine will run processor and memory hard, sometimes around 90%
Might it be a poor choice of preference settings or a corrupt library? Anyone else ever experience this condition? I would appreciate any suggestions.
Mac Pro, OS X Mavericks (10.9.2)