Anybody having same problem with Global Intercative popunders?

Hi!
Despite an open ticket for weeks at Global Intercative their popunders don’t even work when I create them (the call ‘em tags), let alone on my the server where lots of other ads / adnetworks run with any problems. When I asked GI about a status after two weeks I got no response, and the problem persists.
"Not Found
The requested URL /rw was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Apache/2.2.11 (Unix) mod_ssl/2.2.11 OpenSSL/0.9.8e-fips-rhel5 mod_bwlimited/1.4 PHP/5.2.10 Server at www.<Mydomainname>.info Port 80"
Does anybody has the same problem or an idea what causes the problem?
Thanks!

See original post by vahing