[leonsio]

hmm it can be a windows specific problem

try to set an absolute path to the CWD constant
and please check a path in the config.php file from vbulletin
(attention windows and linux have different path
c:/forum/ <-- windows
/var/www/forum <-- linux
)

hmm i think i must find anythere a windows pc and test it

but it is not so simple, as it sounds

i have at work only solaris computers, at home i'm using macosx and my root server is linux .....