I've noticed this problem on the wiki and with bugzilla. It only appears to happen when I'm using the dock (i.e. attached hardware keyboard). Seems fine with the software keyboard. When I try to edit the wiki using the dock, I almost always get to a point where the following occurs: 1. Click on text-entry box. 2. Go to middle of text. 3. Start typing. After every word, when I hit space, the cursor goes to the bottom of the article. I am being very careful not to hit the trackpad. I can type fine with other apps, e.g. the default mail program.