[ubuntu] Help with .jnlp - Natty Narwahl

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http://ubuntuforums.org – Hi, complete novice here...pardon my stupidity! I have Ubuntu Linux 11.04, Natty Narwahl, and am trying to use a Website that runs a .jnlp file. A few weeks ago, it worked fine, but for the last couple weeks I've had this happen: In Firefox: dialogue box - unknown error, try saving the file to disk. If I download the file and try to open with Iced Tea Java 6, nothing happens. In Chromium: the file downloads but again will not open (it used to run automatically) I've not tried running it in Terminal because I don't know the appropriate commands. I have openjdk6 installed and I've not (Hardware)