Is this compatible with http://skyrim.nexusmods.com/downloads/file.php?id=7245 and http://steamcommunity.com/sharedfiles/filedetails/?id=10203? Multiple marriages with divorces would also be cool.
Specialized followers v1.01 should be compatible. I can't check Fixed Followers Lite because it's on the SW; if there are no scripts and the .esp doesn't change any of the things listed under [Compatibility] in the OP, chances are it'll work fine as well.
I have three followers. From time to time, when going from an interior to an exterior, one disappears. I have to do a moveto and a disable and enable to restore him/her; if I don't they vanish into thin air half a second after returning to game from console.
Again, there's nothing in this mod that affects AI packages beyond the original follower system. Are there steps that consistently reproduce the issue? I know that with sufficient followers, there's sometimes a slight delay in how long it takes some of your entourage to follow you through a door. Have you tried waiting a bit longer?
Johnny, if the esp isn't activated, all bets are off, naturally. If it isn't appearing in Data Files, then use NMM or Wrye Smash to enable it.
Warpoet, I think MrDarkSim is right - if the attempted follower has a voice type not in one of the voicesfollower* formlists, they won't get the recruitment dialogue. Can be fixed, but at the cost of having two different voices for the same NPC. The issue with Mjoll is odd, but I'm assuming you're trying to force recruit her before retrieving her sword? In that case, it's likely an issue with dialogue priorities.
As for problems with command mode, I haven't been able to verify, but I suspect it's an issue with the engine itself - the guards' base actor forms aren't flagged as unique, which interferes with the SetDoingFavor native function.
Regarding the reports of fights breaking out easily between followers, do you guys think it's a sufficiently annoying issue that it justifies an attempt at a "fix" as mentioned http://www.gamesas.com/topic/1345602-wiprel-multiple-followers/page__view__findpost__p__20295296
Also Morchai, I've copied your installation guide into the OP; hope you don't mind

Cheers for helping with tech support as well.
Edit: Fix link