Two days ago I installed Wiki. My Wordpress is now largly

Two days ago I installed Wiki. My Wordpress is now largly unresponsive. For example; in the Widgets section none of the normally editable/selectable items are either editable or selectable (it's a dead click). There are multiple other areas behaving the same way, for example, tags in the Wiki entry page will not allow me to save a tag. I can enter the text but the tag is not added. I have logged out/in multiple times, nothing changes.

Finally, (and this is just annoying) the upsell WPMU ads are not allowing me to 'dismiss' the ad. I've added a screencap at http://www.screencast.com/t/dlcwcV0k - btw, the system should probably be smarter enough to know I'm already a member. This is a nuisance.