After it's inserted if you click on it is the base point way off to the side? If it is the base point of that block got moved so every time you insert it, it goes way off because of the basepoint. If the basepoint is where it is supposed to be in other drawings when you put in the same block it would insert how it is supposed too because it would be using the block already in that drawings definitions.
Nick DiPietro
Cad Manager/Monkey
UCS?
Annotative scale works fine, the object can be inserted fine into other drawings and they work as intended.
I would fix them just by reinserting but these are quite large drawings with 100-1000s of other objects in them.
The names are all quite different.
maybe this will help.