I'm really hoping that this is not the tip of the iceberg of compatibility issues between Aperture and Yosemite. I applied 10.10.2 about a week ago and since then I have had about 8 crashes and freezes from Aperture, most, but not all, have happened with Aperture left running on an idle machine. The last couple have caused complete system freezes - with a warning that Aperture has crashed, but once I click thru that screen I get a spiny ball on a dark grey background (my Aperture default) and no way out. Looks like some sort of memory leak possibly? A quick look inside Console only found the following repeating messages related to Aperture before the system probably went south: 2/18/15 3:42:29.914 AM Aperture: ProThemeStore: No theme registered with id=1764 2/18/15 3:42:29.914 AM Aperture: Warning: -[NSProThemeFacet imageForState:value:variant:] unable to find theme store. Anyone have any idea as to what the ProThemeStore might be?