Konqueror seems to have an annoying bug that it'll forget what you've typed into a long textarea entry field, if (and only if) it pre-filled the contents, and you're editing something it had previously POSTed. It's all very bizarre. You can see the bug if you go to the AxKit wiki playpen and edit the text, save it, then try and re-edit and revert your changes.
This is on Konqueror 3.0.1.
