This is one of the weakest aspects of the approach taken by aD. Not only merging users but other areas where one must delete rows in tables lag behind.
There's no real solution in ACS4.x. Jon Griffin and I have discussed the need to come up with one. Janine Sisk (of Furfly) will undoubtably track me down and strangle me with her bare hands if we don't.
Do you have any bright ideas? My life may depend on them! :)
