OK folks,
I had some time to make some testings.
I have put a test swf online. It´s here:
http://www.neuemedienkunst.de/test/sk_test.html
You can reproduce the error with it(I hope so). Further information is in the swf.

Here´s an output of my access-log and error-log:

In my access logfile:
MY IP - - [29/Apr/2001:15:01:21 +0200] "POST /urlto/test.pl HTTP/1.1" 200 189 "http://www.neuemedienkunst.de/test/sk_test.html" "Mozilla/4.0 (compatible; MSIE 5.0; Mac_PowerPC)" (the first call, is OK)
MY IP - - [29/Apr/2001:15:01:36 +0200] "" 501 - "-" "-" (the second call, what does it mean?)

In my error logfile:
[Sun Apr 29 15:01:36 2001] [error] [client My IP] Invalid method in request (the error produced by second call)

Any idea?
How about this:
http://board.flashkit.com/board/show...hreadid=131762