Default facebook messenger chathead

Hi,

Since the update to kitkat and emui 2.3 on my huawei ascend p6 i've been having problems with the chatheads off the facebook messenger app. When i receive a message there's a notification in the drop down menu, but no chathead is poping up on the screen. The only way to open it is trough the notificationbar. The settings are set on active so that isn't the problem! In the beginning i received a short message: messenger blocked to show dropzone...

Am i the only one facing this problem? And does somebody have a solution for it?

Take care!