[horde] horde not saving preferences, imp does

[wurst at eminenz.ath.cx]

whatever i enter in the horde "options" - its not staying in there. i choose 
language, enter any, press save, refresh and its default again. i choose a 
theme, press save (is not applying), refresh and its defaulted again.
whatever i choose in imp is correctly saved and applied (i.e. language, 
themes). interesting is, when i select a them in imp, the lower line with the 
application-links remains in the default theme (blue).
any hints? i'm using mysql as database for horde. 
thanks
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test.php
Horde Versions
Horde: 3.0-cvs 
IMP: 4.0-cvs (run IMP tests) 
PHP Version
View phpinfo() screen 
View loaded extensions 
PHP Version: 4.2.3 
PHP Major Version: 4.2 
PHP Minor Version: 3 
PHP Version Classification: release 
You are running a supported version of PHP.
PHP Module Capabilities
Ctype Support: Yes 
DOM XML Support: Yes 
FTP Support: Yes 
Gettext Support: Yes 
IMAP Support: Yes 
LDAP Support: No 
MCAL Support: No 
Mcrypt Support: No 
MySQL Support: Yes 
OpenSSL Support: Yes 
PostgreSQL Support: No 
XML Support: Yes 
Miscellaneous PHP Settings
magic_quotes_runtime disabled: Yes 
file_uploads enabled: Yes 
safe_mode disabled: Yes 
trans_sid disabled: Yes 
PHP Sessions
Session counter: 1 
To unregister the session: click here 
PEAR
PEAR - Yes 
Recent PEAR - Yes 
Mail::RFC822 - Yes 
Mail_Mime - Yes 
Log - Yes 
DB - Yes 
Net_Socket - Yes 
File_CSV - Yes 
Date_Calc - Yes 
Unknown error: Problem with method call - please report this bug 
(/usr/local/share/pear/File.php:529)
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