Npc names changes randomly!

[Gen_Lee]

Ok, My pbl. When I used the 1st 3 ep I managed easly to change the Npc and townies with SimPe.
 I created a group of 8 ncp in cas, named a1, a2 ....a8.
 Exited game and with Simpe v6beta I chossed the neigbour then sims surgery and the 8 new ncp wher always on top with the names I assigned.
 Today I got Pets and Seasons, instaled simpe v6.2 and when I tried to do the same procedure I noticed that the sims I created where no longer using the names i give them (a1, a2 and so on) but randomly generated names.
 that makes a big problem to find the sims to replace the default npc by them.
 Is this a known pbl?
 Im using also latest version of insiminator and inteeminator.