Jan Vroonhof <vroonhof(a)math.ethz.ch&gt; writes: Yep, I can see that. However, this is exactly the same under FSF Emacs, only the cursor does not disappear. It would appear that when conducting a cursor down, the point goes to the end of the next invisible extent, whereas, on the way back up, the point goes to beginning of the next invisible extent. You can see this if you evaluate `hide-extents' whilst in the "mmc-test-buffer" and then evaluate `(point)' after each cursor up/down. There's no consistency either -- the cursor appears OK when when navigating up to the line with the text `Line: 3', despite the fact that line-number-mode tells me I'm on physical line four, when the text `Line: 3' is actually on physical line 5. Still flummoxed. What gives here? -- Mike <mike(a)lotusland.demon.co.uk&gt;