Sorry gang, when we made the Slicer we noticed that the Window() did not automatically remove any TextArea, Tag or Loader when collapsed and so fixed that - we thought the Panel() was the same so started to fix that and noticed that it actually did already handle it so backed out. When we backed out, we left an addHTML() call in the Panel, which caused a bug. We should have tested the Panel, but thought that it was unchanged. Thanks @karelrosseel82 for the quick report on that. All in all was probably broken for a day or two. Our apologies. Remember, any bugs you find, please let us know here. Cheers.