Update on 30 Sept 2015: OS X 10.11 "El Capitan" is now supported
Important Alert for Mac users: Regarding the newly-released OS X El Capitan Beta: Photo Mechanic has not yet been fully tested or certified on OS X El Capitan Beta, and we can not offer support for that operating system at this time. If you do update your OS, you do so at your own risk. We strongly suggest not updating your main work computer to a new OS if you have looming deadlines. Repeat, if you run Photo Mechanic on OS X El Capitan Beta, we will not be able to offer support with any Photo Mechanic issues you may run into.
This will, of course, change as El Capitan moves towards full public release. We do NOT have a date
for when El Capitan will be supported, because we do not yet know what that will entail.
Having said that, if you do happen to install El Capitan on a test computer and try out Photo Mechanic Version 5 on that for non-critical tasks, we are interested in hearing about your experience in the comments below.