Looking for some Dreamweaver Help?

I'm working on a site in Dreamweaver8 and everything was working fine (8 html files,10+flash movies/text buttons embeded, images,rolloversect.)then i went to edit a few pages and all my css files arent working. divLayers are showing up as doted one line high boxes that span the whole "design" screen(even tho there is text/images/flash videos embedded in the divLayers). But when I preview the page in a browser the css styles seem to be working (but the divLayers and anything I have in them dont show up in the browser, just the basic properties like the bg, font type ect.)so it's looking like the part that shows you what the page will look like in Dreamweaver is not refreshing itself. Flash text is showing up in the "design"but not in the browser preview. I'm using the divLayers for the layout embeding div's w/in div's and draging them around. Does anyone have any idea what has happened? I'm previewing in IE and I have cleaned the cache and tried it again with no luck still help!