I have been using your component without any issues on a Joomla 2.5 site. I wanted to use this component on one of my Joomla 1.5 site. Everything looks good on the admin. I have created categories with appropriate permissions.

Now when I want to ask a question on the front end using a registered or admin user account, I do not see the list of categories on the category drop down. Since category is mandatory, I can not post any question from the front end.