[TYPO3-calendar] view.list.-starttime -2 week doesnt work

[Sebastian Reinhardt]

hi,

i have a couipe of lists in the site: one list showing every event from 
now until +3 month: works!

another list: showing events from -3 moth until +3 month : works!

biut my last list i cant set the starttime to -6 hour / -1 day / -2 week 
/ -3 week (there are events in this period !)
when i set starttime = -3 month  or starttime = -2 month : that works
when i set startime = +1 week or +1month: that works too

but i have to show all events from 6 hours ago until +3 month

what is wrong?
i am using cal 1.4.1

thx for help