Well, turns out there is a mac os 10.5 specific bug that is causing flash based multi uploads to not work on any browser in leopard. It prentends to work by letting you select the file but then it never pushes the file to the server Because, I cannot detect hat you are on leopard with the Firefox user agent. It looks the same on tiger and leopard, I am going to have to provide an old style file upload box option.
FOR NOW USE THE MOBILE VERSION OF THE SITE TO UPLOAD FILES ON LEOPARD.
Adobe is aware of this problem and is working on a fix. It is not limited to estrip multifile flash based uploads but happens on any site with flash uploading including Flickr.
I filed this bug report with Adobe.
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Concise problem statement: The flash player uploads are not working anymore on Leopard in any browser (safari, firefox). The multi file select box pops open, but the files never
This example from my javascript/flash toolkit worked on tiger no problem to upload small jpegs. It no longer works on leopard.
However, It is not limited to my surebert toolkit.
Another popular javascript/flash upload library called swfupload

is also not working in leopard but worked in tiger.
Same for the flickr flash upload utility. The flash upload file selector box appears, but then it doesn't seem to send anything.
Steps to reproduce bug:
1. Try uploading

2. Try uploading a file

3. Try uplaoding images to flickr using their newer flash based upload utility.
Results: The files do not upload, no requests hit the servers access or error logs.
Expected results: The files should upload like they do on tiger[/box]
UPDATE
This has been resolved and there is a new version of the flash player for mac that you can download from adobe labs.
I will hold a brief moment of silence for Mr. Longwell...
There, done!
I can't believe that you made money from something that doesn't exist. Who knows...it could all come crashing down tomorrow and you would have nothing. Right?
Gasp, I can't believe you finally did it!