This version of Reader for Mac users can only be accessed through your browser. It's not your usual 'click & open' process (which will only result in a crash/automatic closing of the Reader program). Instead, drag your pdf file into an open browser window (works fine in Safari but less well in Firefox if various options are blocked. I only figured this out by reading down the list of instructions on the Adobe website. It's not well (aka, clearly) explained otherwise. Who's crazy about this format? Weird... Why change what worked perfectly well as a 'click and open'?