Some days ago I released a little bugfix release of the PHP extension uploadprogress. It fixes one nasty bug with cleaning filenames with preceding whitespace, so an upgrade is highly recommended. It furthermore improves tmp-directory detection, but can only do this during compile time.
Last but not least, the example was improved. It checks for more possible wrong settings (like if the tmp-directory is there and writeable) and gives more feedback. Due to the nature of how this extension works, it may be a little bit tricky to get it working, but the example should help. See also the “ Common issues and some answers” post for some hints.