Obvious question

: you have JavaScript enabled? Many web sites providing video streams will not function correctly unless JS is enabled.
I hate JavaScript.
You do not need to enable Java or cookies or referrer headings.
I don't think there is any user agent requirement, although not providing the correct agent information theoretically could prevent access.
Are you sure you have checked all blocking avenues? Even something as simple as a 127.0.0.1 IP address for a URL in /etc/hosts will prevent sites such as hulu.com from functioning correctly.
Have you tested with a different browser?
Also know that capturing a Hulu video is all but impossible. The Hulu developers use RTMP (Real Time Messaging Protocol) and encryption. Users can only stream Hulu videos in real-time. Users cannot download and time-shift a Hulu video.
