We are aware of an issue that is caused by the recent update of Caliburn.Micro to version 1.5.2. This version of Caliburn.Micro introduces a breaking change and therefore it should have become version 1.6. Due to the breaking change, the WPF version of Cocktail does currently not work with Caliburn.Micro 1.5.2. To correct the issue if your package install picked up 1.5.2, or you manually upgraded to 1.5.2, is to uninstall Cocktail, then first install Caliburn.Micro 1.5.1, followed by Cocktail.
The issue will be corrected in the upcoming Cocktail 2.4 release.
We apologize for the inconvenience. Rob Eisenberg, the author of Caliburn.Micro is aware of the issues the incorrect version number causes.
Edited by mgood - 02-Aug-2013 at 11:25pm