I had massive issues with Firefox 3.6.6 Win and the Flash driven upload. IE and Opera worked, just Firefox gave an IO Error #2038. Since updating to Firefox 3.6.7 the issues are completely gone, all works fine again, even when re-using the old 3.6.6 profile. I thought I'd share this.
Worked (and still works) for me as expected. Just for your information :)
I'm glad I found this thread, at least I'm not the only one going nuts with this :-)
I'm encountering the same problem. I'm trying to hunt down the problem in one of my plugins (see http://forum.coppermine-gallery.net/index.php/topic,63693.20.html (http://forum.coppermine-gallery.net/index.php/topic,63693.20.html)). I disabled my plugins to make sure I was no longer interfering and then I noticed that under
Firefox 3.6.8
Chrome 5.0.375.126
The SWF-Upload fails. I can't make out a particular error besides the flash-box turning red with the error message and a pop-up coming up.
With my IE 8.0.7600.16385 it works fine which confuses me even more.
Anyone has a clue, what might cause this behavior and even better: how i could turn it off? ;)
Cheers Florian
(CPG is 1.5.8 current download)