On Arch with Kube 0.7.0 a click on any message results in what seems to be a conflict with the standard application for the data:text/html MIME type. It tries to open the default navigator and results in an error by KIOExec:
File not found: data:text/html;charset=UTF-8,%3C%21DOCTYP…3C%2Fbody%3E%0A%3C%2Fhtml%3E%0A%3C%2Fbody%3E%3C%2Fhtml%3E