[TYPO3-calendar] Backend login fails after extending event table via kickstarter

[Lars Beck [e8media]]

Hi everybody,

I'm using Typo3 in version 4.7 together with the cal extension to 
provide an event calendar, this works fine. To show some futher 
information (e.g. admission price) I extended the tx_cal_event table via 
kickstarter, this also works as expected. But there is no way to access 
the backend again once I someone has logged out, Typo3 simply does not 
accept the given access data. This issue only appears when extending 
tables related to cal, any other extension works.

As an absolute beginner I would be very happy for any ideas. :'(

Furthermore this question has been asked in German before by accident, 
I'm sorry for this.

Cheers,
Lars