I've been encountering a repeatable problem with every version of Photo Mechanic to date. Currently I"m on 4.5.1.1. I use a Mac Pro 3.0 ghz with 6gb of RAM. The problem occurs when I'm scanning through nefs. If I go quickly through them either pausing for a second or so, or I hit the right arrow quickly to get to a particular image which is visible on the lower "filmstrip" the image stops changing and the screen freeezes. Sometimes it catches up after hanging for 10-20 seconds and then subsequent images come up and freeze in turn for varying periods of time. At the same time I can hear my hard drive seem to go wild cycling and clicking like mad. Usually I have to have activity monitor force a quit and then re-srtart Photo Mechanic.
Thanks, Rich