I had a strange situation: when i was logged out and simplecache was diabled, no CSS was loaded. The site looked like ugly.

But i found a workaround:

In

\engine\start.php

i added the lines at the very end:

// Force simplecache update if simplecache is disabled
if (!($CONFIG->simplecache_enabled)) {
    datalist_set('simplecache_enabled',1);
    elgg_view_regenerate_simplecache();
}

 

Perhaps this can help someone else!