Why are my Login Items cleared upon restart? Since I have been using OS X El Capitan 10.11.3 (Beta 15D13b), most of my login items are not remembered. With the exception of Dropbox and WD Quick, all other applications I put into Login Items (e.g. Chrome, Mail) are removed from the list again after a reboot.

This is quite annoying; none of my apps launch (regardless of whether I've set them to hide at default) and the list is apparently cleared upon launch.
What is the cause for this, and how can this be solved?
I can't comprehend the behavior of LoginItems in El Capitan 10.11.3.

But one measure is to delete com.apple.loginitems.plist and then re-populate it from scratch.

Another workaround is to simply lock the file after adding all items which should be started after logging in.