Once again a bugfix release of CakePHP has been released. The release is labelled as 188.8.131.5215, but in fact it is 184.108.40.20617. If you get an error in the ConnectionManager class, you were too fast with downloading the new release and you got a faulty version. In that case, download it again, and the problem disappears.
Happy baking :)
Update (2006-11-04): In the meantime version 220.127.116.1125 has been released, which fixes some more bugs. Thanks to Dieter@be for the hint!