i had the same problem m8 what i had to do was go into phpmyadmin go to the database that your dolphin is stored find tables adminmenus its the 3rd one down on my database then on id 9 make sure these forms are right
url = articles.php
Title = Admin Articles
order = 5
cat = 3
the rest i left blank im sure there was somthing in there b4 but seems to work after, i take it you went to edit one of the admin menu bars and it went tits up from there lol

anyway if its not that i would check the see more other forms in that table see if they look correct.