We apologize for the instability of composr.app and appreciate your patience. We are working on the statistics addon and trying to find an optimal way to store and render data. Unfortunately, we have yet to find a solution that can handle the traffic (and therefore, tens of millions of statistical records) of composr.app. We're working hard on one.
#2592 - Missing language string when editing Comcode page
I am using the <tempcode params="{+START,IF,{$NOT,{$IS_GUEST}}}">{$LOAD_PAGE,start,site}</tempcode> code Malatesa posted. However, I made that change 2 days ago, and this just appeared today.
My best guess is it is lang cache corruption when a sitemap is generated, and a delayed display of the menu.
Let me know if it reproduces after clearing the language cache.
(Click to enlarge)
I could not spot before as there's some dynamism in picking of the language strings, a code search missed it