AdSenseWidgetError

Adding or editing an AdSense page element from your Layouts section may return the error message "An internal error occurred. Please try again." As a workaround to this issue, copy your AdSense code from your AdSense account and insert it into an HTML/JavaScript page element in the layouts section of your blog.

CantSeeAddPageElement

Some users report that they are unable to see the “Add Page Element” links in their Template | Page Elements tab. This occurs when the blog incorrectly tries to display from a URL with “www2” instead of “www.” To work around this problem, simply remove the “2” from the URL.

Update, 5/24: If you are still experiencing this issue but do not have a "2" in your URL, then there may be JavaScript causing the "Add Page Element" links to disappear. Please ensure that you put all JavaScript into JavaScript page elements, instead of directly into your template code.

It is currently not possible to add new Feed page elements to your templates. We are working on the issue.

Update, 5/9: it should now be possible to add new Feed page elements to your templates as expected.