I have traced the errors that some are getting to the sidebar. Basically if your sidebar blocks are all set to "Disabled" you will get the errors at the top of your page. If you just change one of your sidebar blocks to "Enabled" your errors will go away. You can still leave the main bar disabled which is the very first option in your sidebar list, but just ensure atleast one of the blocks is set to enabled. I'll make a permanent fix soon.