As a response to 1), I'd say that Safari's pop-up blocking is probably pretty simple. I mean, it doesn't even have an ignore list, and Safari hasn't really had any updates since its release about two years ago. Ever since Internet Explorer incorporated a popup blocker (with SP2), sites have probably started figuring out other ways to use popups and to get around the less advanced popup blockers. Firefox is constantly being developed, and the 1.0 release was less than a year ago so it's probably less suceptible.
As for 2), perhaps Graphic Converter just isn't very good at reading PDFs. It only recently got the ability to read PDFs, so it's possible that all the bugs regarding PDFs haven't been worked out yet. I'd suggest using Preview's Export feature to convert screenshots to JPGs, and then you can work on the JPGs in Graphic Converter if you want to resize or crop them.
|