For the missing system tray on the latest insider build, this can be fixed by adding the following registry key:
HKEY_CURRENT_USER\SOFTWARE\Stardock\Start8\Start8.ini\Start8
Create a new key of type REG_SZ with the Name "OldTaskbarOn11" and give it a value of 1.
Then sign out and in again.
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As noted before we do not officially support insider builds of Windows for these reasons.
I would recommend people stick to released versions of Windows. If Microsoft don't support it then don't touch it on anything you use on a daily basis unless you are a software dev.