If you are using Tiki 1.10, and Ajax is activated, try deselecting it on the Admin Features page.
If you are using Tiki 1.9+ or 1.8+, then Tikipedia should work as expected. If the links on MyTiki don't do anything, try inputting the URLs (such as http://(yourdomain,etc.)/tiki-user_preferences.php) directly to see if the problem is with the linked pages or the MyTiki page itself.
(Nice to hear from Douglas County — I'm assuming that's where you are. I'm from Klamath Falls, Oregon, myself and have good memories of that area. But I got a server not found error with the URL you gave; maybe a typo?)