[TYPO3-calendar] Year View/Month View -> blank Page

[Jan]

Hi,

I got about 1000 Events stored in the database.

List View, Day View, Event View are running fine.
Using Year- or Month View I only get a blank page. Error reporting is 
on, but it shows only Notices.

TYPO3 4.5.11 + cal 1.4.1
memory_limit 256M
max_execution_time 120


I already tried a higher memory_limit and max_execution_time, nothing 
changed.

Currently I dont have an idea how to get this running ... any hints?

Best regards,
Jan