Multiple Image Upload not working on macs

Hello everybody,
I have searched everywhere for an answer to this issue and I'm not sure if there is a solution yet.
I am hoping someone reads this and tells me if either I need to use another product or post a fix for this to work.
I am developing a website for a photographer who needs to upload the pictures he takes for his clients to review on his website.
So on the backend I have created an application where he logs in and creates a new client and then uploads multiple images to that client's folder.
I am of course developing the site in ADDT version 1.0.1. in Dreamweaver CS4.
Everything works as expected except for the image upload part, where he is unable to upload even a single image.
He is using Mac OS X and Safari 3 to access his site.
I use a PC and can upload images perfectly, but the whole purpose of the website is for him to be able to upload images without me.
I read somewhere that ADDT's Multiple Image upload did not work on Macs because of the way that the OS handles image uploads to the server via HTTP. I also know that Flash v.10 had an issue with this behaviour in the past, but that it's been fixed with ADDT's v. 1.0.1, which is true since as I said I am able to upload images from my PC using that Flash version.
There is a product called MultiPowUpload from Element-IT (http://www.element-it.com/MultiPowUpload.aspx) that seems to do the exact same thing as ADDT's Multiple Image Upload, and I have tested the Demo version both on Mac and PC and works perfectly well.
I really would like my ADDT behaviour to work, first because I already have the whole site developed in it, plus I am used to the software already, and also because Element-IT's product is a bit pricey for a multiple server license (which I would need for other sites I plan to develop for Mac users).
Any thoughts or pointers you might have will be greatly appreciated.
Thank you in advance.
Luis Herrero.

Thanks a lot for your replies and helpful ideas.
It turns out that for some strange reason the problem was with the hosting provider.
I have moved another site which was not working with Macs either to a new provider and everything works now as it should be, without changing any files at all.
I have in fact v.1.0.1 in both those sites (those were the first things I checked before posting here) and Flash Player v. 10 both on the Mac and PC, so it will remain a mystery as to why the server behavior did not work with that particular host on Macs.
Thanks again.
Best regards.

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