So, when I'm writing a post that's large enough that the toolbar detaches and starts floating at the top of the page, using the link button makes the toolbar disappear and I have to scroll the page for it appear again. Confirmed on Firefox 24 and Chromium 28.0.1500.71 on Linux, though I've experienced this on older versions.
Bonus bug - when right-clicking on a table when writing a post, it should bring up the menu to edit the size of the table. In Firefox (all versions I've tried it with) however, it disappears immediately making it impossible to use it. Works fine in Chromium.