System requirements say my iMac 2.16 ghz with 4 GB ram Graphics ATI Radeon X1600 128 MB should run this program. (lightroom 5.2) also tried 5.3. Can you tell me why not? Not using any movies and only doing 40 slides. Help!!! Just bought this and need to return if this won't work. thanks! PS Not mad, just sad. I know there are way too many computer configs to solve everything.