Just so people know: Version 2.1.5 of our WHM Plugin (included with LSWS 4.2.18 and up) automatically changes mod_ruid2 settings in WHM to settings that work with LSWS when switching to LSWS (and switches the setting back when you go back to Apache). mod_ruid2 is incompatible with LSWS, but you don't need to manually turn it off before switching to LSWS any more.
Cheers,
Michael