Did you disable all AddOns except "Tukui" and "Tukui Config"?
Did you get an error? If so then post it below (use 'code' bbcode):
Please describe the issue in as much detail as possible. If you know how to reproduce the issue then mention that too:
When in a raid there's no options to assign roles.
You can't righclick someone and select "Promote to Tank" because the option doesn't exist.
This option becomes visible as soon as I disable TukUI.
Please include screenshot(s) which illustrate the issue (you can attach them to this post):