When you click "save", the edit box becomes grayed out. If you get a timeout error (or whatever causes AWB to restart), AWB just re-processes the article from scratch automatically, and you lose all your manual changes. It would be IMMENSELY useful if, when you click "stop" to interrupt the re-processing, that the edit-window would become editable again so you could keep your changes (via crtl+c), or that AWB would prompt you before reprocessing the page, giving you the option of keeping your changes rather than start from scratch.
This happens to me every now and then, and I always lose massive amounts of work. @Headbomb 06:32, 12 February 2011 (UTC)