Just link it - "topic 565" doesn't help anyone.
http://forum.simutrans.com/index.php?topic=565.0
And next time you should also transfer the version information (apparently it happened with 100.0 and pak64).
General statement: always check with the latest nightly version (of both simutrans and the pakset) if the error still occurs. And make sure you use a
clean "installation" of simutrans (not copying every new version over an older one).
Maybe the same problem as http://archive.forum.simutrans.com/topic/07960.0/index.html , and solved in r1886.
Try latest nightly.