If you resize the browser window while editing, the Carousels' items properly adjust their widths, but the logic to scroll them somehow doesn't, leading to an usable component until you reload the page manually.

Symptoms are:

• the teasers adjust their widths, but switching to a different teaser leads to teasers being half visible, half hidden. The calculation seems to still be done for the old browser width.
• the tab containing the component placeholder to add a new teaser is broken (if you resize a narrow window to make it wider)