FCK 2.5.1 ... blocked at new

Hi,

After install ... nothing works, even _samples
...but it works on another server.

It seems to be blocked while calling the constructor.

Because it running well on another server, I suspect something on the unworking machine (running on a subdomain with Plesk ... yes, I know :>)
I've been looking for somes infos about httpd.conf and/or php.ini on the forum but found nothing
If someones has an idea ...

best regards
prm