There is some code that checks if the forum permissions for "View" (in advanced mode) are set to "ALL". If so, then the forum content will show up in the rss feed. If you set view for any forum to "REG", PRIVATE, MOD, or ADMIN then RSS Content Syndicator will not show content from those forums.
MOD supporters:
Above is exactly why I was coming here to make a post (go figure). There is a Small bug here. Lets say I have a forum set so that "View" is set to "ALL", but "Read", "Post", "Reply", "Edit", and all the other are set to "PRIVATE". The RSS code WILL display the contents of those forums, as it doesn't check the "Read" permissions. Fortunately I double-checked things, or this could have caused some problems for me.

Thanks for the excellent code.
KyferEz
PS: Any plans to add a cached output?