In my project, we have set up a AEM package containing ACLs, user and groups definitions. This worked perfectly well in AEM6.1: ACL, user and groups were installed and are working.
I tried to install the same package in AEM6.2. The installation works well and the permissions are also set as desired. But after a restart, the project explorer and sitedamin do only display a white page and the JS console of the browser show an error "Uncaught ReferenceError: CQ is not defined" (for project explorer: "Uncaught ReferenceError: moments is not defined").
The reason is that it overwrites the existing Access Control List and only the Access Control Lists from your package remain valid. Therefore you will have to change AC Handling in the Advanced tab when compiling the package. At the moment you have Overwrite in there which is why you get your problems. You should have MergePreserve in there so that the existing ACLs do not get overwritten.