The most common reason for this is explained in this codex article: http://codex.simple-press.com/codex/faq/troubleshooting/what-is-this-jquery-conflict/

Check that out. If this is the problem then it is usually pretty easy to correct. if not then we could do with a link to your forum page to look for other such conflicts.

Hi!! Thanks for your Answer!

I looked the code in my website and looks like this..

<script type='text/javascript' src='http://www.internetbingosites.com/wp-includes/js/jquery/jquery.js?ver=1.7.2'></script>
<script type='text/javascript' src='http://www.internetbingosites.com/wp-content/plugins/simple-press/resources/jscript/checkboxes/prettyCheckboxes.js?ver=3509'></script>
<script type='text/javascript' src='http://www.internetbingosites.com/wp-includes/js/jquery/ui/jquery.ui.core.min.js?ver=1.8.20'></script>
<script type='text/javascript' src='http://www.internetbingosites.com/wp-includes/js/jquery/ui/jquery.ui.widget.min.js?ver=1.8.20'></script>
<script type='text/javascript' src='http://www.internetbingosites.com/wp-content/plugins/simple-press/forum/resources/jscript/msdropdown/msdropdown.js?ver=3509'></script>

So far so good. So the next thing is I will need that link to your forum page…

Here is the link:

http://www.internetbingosites.com/forum

Do you need access??

Your WP theme is not making the mandatory call to the wp_footer() function. This is required by both WordPress, SP and many other plugins and does need to be in place.

If you are not aware of how to do this I would suggest you look at the default WP theme footer template file which will show you where and how to add this required call.

Thank you for your help, it saved us a lot of time and is now working. Thank you so much!! 

np. glad we could help!