[horde] another blank page victim

[hq]

hi.

i now have discovered the blank page problem by myself.

even cannot proceed to configuration screens of the modules.
horde.log gives no clues.

at first i thought it came after updating my mysql-server. but i checked 
it and it is up and running fine.
problem is i haven't logged into horde for some days and haven't seen if 
it already failed BEFORE the mysql update.

i am currently browsing the system for any clues with this issue.
the stunning thing is that horde was up and running perfectly with 
several modules, no changes were made and *boom* you get only a blank 
page instead of the module page.

greetings
peter