Shock, where are the members?

My plan: Actually I am about to launch, field test it and if everything works smoothly then purchase the Pro of CB.

BUT: Suddenly, my members list (the entries actually) disappeared. :S
I did not modify any CSS or PHP-File of CB!




Edit: The Profile Fields are gone too :S This happend after I switched off "Frontend User Parameters". But, I turned it on again!! It still looks like this.



What did I do wrong?

Addendum:

* I created a new members list: same result
* I did check the usergroups (there are members definately!)
* It says "...has 5 Registered Members"
* I checked the fields to show
* It's all public / publishes

Still: no enties in the members list :S

Addendum 2: I chance the display to grid. Now I am even more confused.

I got closer to the solution. Members data is showing up now. I disabled some tabs Profile,... After activating them, the members data is back.