Anecdote: A few years back I wrote a Flash 8 piece for a relatively large ad campaign.  The code ran fine on everything except OSX/Safari.  Not only did it run poorly, but it had the strangest behavior: it ran poorly the first time you visited the site with Safari, but if you reloaded the site, everything ran fine.<p>I bought a Mac mini to try to debug the problem, but without dev tools I was at a loss.  After sharing my frustration amongst my circle of friends, a guy that did a lot of OSX work decided to take a look with some debugging tools.<p>From what I recall, he discovered that Flash was making a perfectly valid call to an API method that should have been deprecated.  The bug report was filed with both companies and I can only hope that one of them paid attention.  The hack to get it to work on OSX/Safari wasn't pretty.