I do use dhtml effect, like expanding text, but and even the pages without it bring up the error. Today, I'm not even getting an error, it just does nothing. I select Preview Topic from the right-click menu and nothing happens, not even an error (even on pages with DHTML effects). Before the holidays I had no issues, but when I came back from vacation, these issues started happening. It's very frustrating.
Doesn’t the Preview rely upon your default browser and its security settings? I never really use the Preview because I know it’s not what the help is really going to look like in the finished product; I find it faster to just generate a draft copy & have a look at it then.