child pid x exit signal Segmentation fault

Hi,

I use:
- Fedora Core 3 Linux
- Apache 2.0.53
- PHP 4.3.11
- FCKEditor version 2.1.1

When using the filemanager of FCKEditor I get this:
child pid xxx exit signal Segmentation fault (11)

where xxx is a number of course.

I did this in (...)connectors\php\config.php:
$Config['Enabled'] = true ;
$Config['UserFilesPath'] = '/var/www/html/testsites/asessor/userfiles/' ;
$Config['UserFilesAbsolutePath'] = '/var/www/html/testsites/asessor/userfiles/' ;

I read about memory problems on Google, but top shows nothing alarming (I think):
top - 07:06:49 up 33 days, 16:25, 1 user, load average: 0.06, 0.03, 0.00
Tasks: 136 total, 1 running, 135 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.1% us, 0.1% sy, 0.2% ni, 99.5% id, 0.1% wa, 0.0% hi, 0.0% si
Mem: 2074780k total, 1038680k used, 1036100k free, 191040k buffers
Swap: 2031608k total, 532k used, 2031076k free, 400708k cached

Can anyone help?