File upload is stupendously broken in Flash, on all browsers, on OS X Leopard. As details come out I'll see what I can learn here. We have been searching for potential fixes here today, for some of our applications depend heavily on this feature.
First I found this little post here, and then in the comments of Mike Chamber's Blog people are also experiencing this issue with AIR. Lastly there is this forum post that shows that Adobe has become aware of the issue:
This issue has been addressed and will be implemented in the next release of Flash Player. Regards,
Darren J. McNally,
Technical Support Engineer, Adobe
Flash/Flash Player Support
My first thought is that while its nice that they're going to fix it, I think this needs to be addressed now. I mean, like, right now. Big companies are going to lose money on this. People expect consistent functionality, and this is a real showstopper bug on a big feature.
So far I've looked at the headers being sent by Firefox and Safari to see if there is any useful information:
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:18.104.22.168) Gecko/20071008 Firefox/22.214.171.124
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-us) AppleWebKit/523.10.3 (KHTML, like Gecko) Version/3.0.4 Safari/523.10
So as you can see, we can tell....that we're on a Mac. Of some sort. Not very positive so far. Hopefully some more useful information should follow.