I read another post that had a similar experience and found that adding the line:

 

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I updated my version of Flash to 10,1,53,64 release candidate 7 because of 0-day vulnerability and now the button to select files does not work with Firefox.  The control still works in IE.

 

I realize that something else could be causing the problem, esp. since the control works in IE, but I just wanted to bring it to your attention since Adobe will be releasing this version of Flash soon.

 

Also, is there a way to force AJAX Uploader to use either the Silverlight or basic method?

 

Thanks