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Steps to reproduce:
-or-
*Added 12/8/2010.
**Version 2.3.5.5 on Windows 7 64-bit.
Sorry but I'm not able to validate the problem you report. I just tested the shared files feature on the demo site and it worked as expected and uploaded the file.
On my Windows 7 x64 computer on which I am also running the browser, a red "x" (missing image) appears over the 'Add File...' button and renders the button inoperable.