Both cams are working perfectly in each 4.2 rom...maybe either you guys are possessing new A110 device (in which back cam is not working in 4.2) or you are mssing something in procedure while flashing the rom..
If former is the case..have patience..our devs are working hard to solve the issue asap.
But if latter is the case..try to flash the ram with proper procedure described in the OP of that respective rom thread.
HIT THANKS IF I HAVE HELPED YOU
Sent from my A110 using xda app-developers app