[TYPO3-english] own extension in TYPO3 6.0 causes logouts in BE

[Domi]

Hello,

I currently try to get 6.0rc1 running on a current dev snapshot. I 
always use a little extension for holding all CSS, JS, FluidTemplate and 
TypoScript files together.

In 6.0 after install of the extension, I get always automatically logged 
out of the BE, no matter what kind of actions I do in BE.

Is there anything changed of what is necessary for the install of an 
extension? Is there a basic (empty) startup package for an extension 
existing?

Best Regards,

Dominic