Alex,
Just today I had someone tell me that the links at the top of the designer are not opening anything. I checked it out and I had the same issue in Chrome and Firefox, but it was not an issue in Safari. When you click on the links, it shifts everything else below it down like 20-30 pixels throwing off the whole layout. I really haven't done anthing to my CSS in a year so not sure what the issue is. Also, just noticed that with my layout, my once popup login now is located below the entire designer as a div and not a popup (this could be because maybe you have added a new CSS label or something and I just didnt know about it). Let me know if you are experiencing this same issue or something is just wrong on my end. Thanks!