[horde] installation problem with horde 2.2.1/imp 3.2.1

[horde-list-2003 at digeda.gs]

Hello,

today I've installed the software on a new webmail server. The test.php
are fine, but if I try to access /horde/ or /horde/imp/ the browser says
"the document contains no data". The php imap support test
(/horde/imp/test.php) is also successful, but the application itself isn't
working. :(

In the error log of apache I've found:

[Sun Apr 13 20:51:32 2003] [notice] child pid 29928 exit signal
Segmentation fault (11)
[Sun Apr 13 20:51:33 2003] [notice] child pid 29935 exit signal
Segmentation fault (11)
[Sun Apr 13 20:51:33 2003] [notice] child pid 29934 exit signal
Segmentation fault (11)
[Sun Apr 13 20:51:33 2003] [notice] child pid 29933 exit signal
Segmentation fault (11)
[Sun Apr 13 20:51:33 2003] [notice] child pid 29932 exit signal
Segmentation fault (11)
[Sun Apr 13 20:51:33 2003] [notice] child pid 29931 exit signal
Segmentation fault (11)
[Sun Apr 13 20:51:33 2003] [notice] child pid 29930 exit signal
Segmentation fault (11)
[Sun Apr 13 20:51:33 2003] [notice] child pid 29929 exit signal
Segmentation fault (11)
[Sun Apr 13 20:51:35 2003] [notice] child pid 29937 exit signal
Segmentation fault (11)
[Sun Apr 13 20:51:35 2003] [notice] child pid 29936 exit signal
Segmentation fault (11)

but nothing more. I've googled a little for the problem but I've not found
hints to solve it.

Thanks for helpful hints

/Micha