Hi Tobias,
I apologize for the late response.. your response must have ended up in my spam folder for some reason. I came back to the issue today and looked through the support list until I found mine and saw that you had responded a week ago, thank you for that!
Yes, that WP_DEBUG constant cleared up a bit I think.. there were several errors, and most had to do with the theme, so I switched the theme to something else, and lo and behold, your plugin worked like a charm. So I created the tables and switched the theme back. Thank you so much!!
Best regards,
Johan