Login items disappearing from list after reboot
After updating OS X, I noticed, that some application not running after rebooting (for example Google Drive or iMessages). In "System Preferences -> Users & Groups -> Login Items" list contain only one item (dropbox), but it should contained other apps.
I manually add all needed apps, reboot system. Apps launching at login. But in "Login Items" again only one item - dropbox. After second reboot - only dropbox launching.
Why custom Login list disappear after reboot?
P.S.: sorry, for bad english
Mac mini, OS X El Capitan (10.11.2)