Having issues uploading to Alfresco Share using its Adobe flash up-loader?
As weird as this sounds, try updating your installation of Internet Explorer.
Even if your not using Internet Explorer, lets be honest who still is! 🙂
This has solved issues that we’ve been having, machines which still had IE6 on them, when updated to IE8 the up-loader would work in both Firefox and Chrome.
It also allowed us to use Primefaces 2.2 fileUpload on the machine it wasn’t working on, after updating IE.