Hey there...

As soon as I activate K2 on my joomla site, I notice two problems:
- The user registration and profile editor get layout problems (width way too big) as shown in pics attached.
- I cannot set a user permission to create a new article. I correctly set the group and the permission to create, but the k2 user module does not show the option...

Any tips?

Without K2

With K2

With K2

This is a CSS issue.
In your template's stylesheet there is a white-space: nowrap value that causes this issue.