I recently hit this same problem myself, and found that it not only doesn't work with Safari, but also Chrome.
After much head-banging (and significant help from a co-worker), I did find a work-around.

Edit the file /extras/progress.js, and modify line 85 as follows: 

-    req.open('GET', url, Boolean(handleUploadProgressResults));
+    req.open('GET', url, false);

[download]

It appears that the call to handleUploadProgressResults will always return true in Chrome/Safari. No idea why, but modifying (hardcoding) this to false does get things working.

cheers,
Darren

In reply to Re: Apache2::UploadProgress & Safari bug status?? by McDarren
in thread Apache2::UploadProgress & Safari bug status?? by tlhackque

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