Yes, I have installed some mods, but I think I removed and reinstalled everything.
When I go to the administration section it opens up the side panel correctly, but in the main panel it is showing the forum. If I click on any of the options within the panel it just shows the forum in the main panel.
Even if I copy the address of the administration page I want to use in another IE it still returns to the main forum.
I tried this on two machines in case it was a local cookie problem, but it did not fix the problem.