Is "preview", perhaps, disabled on your Dreamweaver? I have had no problems with the preview so far.
To check, (keep in mind, I am on Mac so I am not sure how different this will be on Windows), you need to to go to EDIT > WebAssist Preferences... then in the dialogue box, click the preview and in there is a check box that when checked will disable the preview.
Well, I want the preview enabled, so I can see the changes as I make changes in the options from the tabs. I suppose I can disable the preview in the web assist preferences, but that's not really fixing the problem, rather just hiding it. However, to answer your question, it is not disabled at the current time.
Thanks for the response,