AdSense-Deluxe2 2.1.1

WordPress 2.8.3

The plugin still works (ads display) but am unable to edit the plugin’s settings. Here’s the error:

You do not have sufficient permissions to access this page.

I last changed settings last spring, but recent changes have broken it.

Sounds like a directory rights problem but both plugin and adsense directory is 755 and I certainly have admin right to the blogs.

Any pointers to the right direction is appreciated!