[cellarius]

First of all, I'd really appreciate if you would speak of sigpics, not sigs. This is not about 4 signatures, but about signature pictures, and it confuses me all the time if you go on about people having 4 signatures.

Second: The number of sigpics is checked against permissions when the signature is created. If the user has permission to use 4 sigpics at the time of creation, he can create a signature with 4 pictures. This signature then is used until he changes it, nom matter what permission changes happen until then. Only when changing the signature the number of pics is checked again. There is no way that I'm aware of to change the signature automatically when the permission is revoced.

It may be possible through an addon - you might have to remove the signature as a whole. Possibly using regex it would also be possible to only remove the last three sigpics.