Arelith

I have a real hard time controlling my summoned mummies, unlike the vampires who work fine for me, the mummies sometimes stand around refusing to attack, ignoring commands. Sometimes one of them will also stand by me while the others fight as commanded and no amount of telling him what to do will suffice.

As a result i barely use them now and resort to the more reliable Vampires.

i haven't personally experienced this issue (don't play any animators atm) but I have heard of it from several sources

The mummies do tend to do this just use the player tool to select all summons and then click them to attack.
The water elemental does this fairly often also ive no idea why.

This happens to me all the time.

The same thing happens to every kind of summons. AI seems broken at the moment.

Mummies do this because they seem to have an inner conflict between using their spell like ability and attacking. Essentially their AI asks them to use Fear Aura or WoF, whilst they try to attack. Essentially cancelling out the actions of each. This can be helped by using the playertool though.

It is the same issue as say Slime Cubes whom will try to use their bolt attack, but will freeze due to their changing target as you attack or are attacked or try to tell them to attack.

I concur this happens when macro'ing nearly any summon, be it an elemental, a Deva, balor, vampires, etc.

Also, some have commented using the player tool helps, yes, but only sometimes, and even still, the summons will just stand still for turn upon turn, flatfooted.