I've created a WebHelp Help system using RoboHelp 8.0 HTML. When I open a Help topic in FireFox 13 and click Print to print the topic, I get a "Printer Unavailable." error message. When I click OK to the message, the topic prints anyway. When I open a Help topic in IE and go through the same sequence, I don't see the "Printer Unavailable" message before the topic prints.
I know this may be a FireFox configuration issue rather than a RoboHelp HTML issue, but perhaps someone else out there has run into this behavior in FireFox and found a way to stop the "Printer Unavailable." error message from appearing.
Interestingly I was speaking to someone yesterday and they had the same issue with something entirely separate from RoboHelp.
That prompted me to starting entering Printer Unavailable into Google. Predictive searches showed this is a well known problem.
Try Google. I think you will need to involve your developers.
See www.grainge.org for RoboHelp and Authoring tips