I think I know what this is. Download a route from the http://gnuite.com:8080/cgi-bin/gpx.cgi/ within a wb browser. Look at the last waypoint line before the arrival line. It looks like this:

<trkpt lat="" lon="">

Delete that line. Remember to alter the previous line from eg:

<trkpt lat="51.30526" lon="-0.79368"/>

to

<trkpt lat="51.30526" lon="-0.79368">

to allow the <desc> tag to be fitted in and it seems to fix the problem. I'm not sure if this is a problem with the directions site or maemo mapper (I'm running version 1.4.6 on N800).

Try it and see if it fixes it.

Grim