I'm a bit stuck. I've just installed 10.10.4 and now there's no access to Aperture. The icon in the dock has been replaced with a white circle with a bar through it on a grey background. When I click on it I get a message saying Aperture isn't compatible with Yosemite. Odd as I've been using them together for a number of months now. Has anyone had that problem and fixed it or have any ideas how to sort it? Help would be much appreciated!