Users that allowed to write items, can't change there articles in frontend anymore, after installing K2. The items can now only in the Backend be changed. There is no writing icon that previously stood on the articles How do I fix this?

In the config of K2, I select the writing option for Frontend.

Does the user group have permission to edit items?

eh.. oops.. yes, your right, I had not seen that in K2,were also users groups and users. Thus now completely working and solved, thanks.