excerpt from frame source
The "weird bunch of characters" is known as the BOM (Byte Order Mark). The problem is on the server.
I saw the same thing when first using RoboHelp 8 and this is what I was advised by the company hosting my site.
"I would therefore conclude that the solution to this problem (on Linux systems running Apache) is to add the AddDefaultCharset utf-8 directive to either the Apache config or the site .htaccess file. The advantage of the latter is that it only affects individual sites. The default Apache character set is taken from the locale file on Linux and defaults to iso-8859-1. It is the conflict between the Apache header with iso-8859-1 and the page character set of utf-8 that obviously causes Firefox a problem."
In a forum post Chrissy_Tissy added
My machine is Windows, but this fix still worked - some notes about making the fix visible:
1. Do the fix itself (httpd.conf: AddDefaultCharset utf-8).
2. Restart the box to apply the fix.
3. Once the box is restarted, clear your cache in FireFox to make sure you don't continue to see the cached file.
Once all this is done you will see the output content as expected.
See www.grainge.org for RoboHelp and Authoring tips