I know that some a2 modules are declared uncompatible with ruid2 (i.e. google pagespeed, mod_cache, disk_cache_module...)
if this is the case, sound like a unavoidable reality or an upstream bug the big problem is that upstram do not change code since 2013 [1] Alessandro - Lota [1] https://github.com/mind04/mod-ruid2
