I had broken images in all my subsites but not the main site in my multisite. With help from Ipstenu I got it working again by readjusting the .htaccess file. All the images are visible again. But in the process I deactivated all the plugins to see if any of them were the cause of the broken images. The plugins were actived again. Events Manager was activated again.
I am now getting a 404 error on all the events pages: http://lyskinesiologi.no/events/
I'll also go into the backend and click view event and it does not come up, but just gives me the 404 error. I am puzzled on where the error is located. Perhaps the htaccess file perhaps some place else. I do now know yet and need some help.