Normally when I'm editing a post, I can click "Choose from the most used tags" and all the tags I've used the most will appear just above that link. I click on the ones I want, and it adds them. I can then add others, click Add and the tags are done.
Now, when I click "Choose from the most used tags", the page reloads. That's it.
Also, when I click "Set featured image", the media uploader loads in the same window, rather than as a modal window overlaying the post/dashboard/interface. I can still set the image, but then have to hit the back button or switch to another tab to update the post.
When I select some text and click the hyperlink button, a modal window appears. I enter the desired hyperlink address and click Update, and I'm suddenly looking at a list of all posts, with the one I was editing unchanged.
What the heck is going on?
The blog is hosted on wordpress.com, so I don't have an plugins, and since I can't find any version numbers, I can only assume that I'm using the latest version.
I've tested this problem, and it appears in the current versions of Chrome, Firefox and IE.
The blog I need help with is moderndayhitchhiker.com.