Thanks much Eskimo, as usual... Le'me go thru all what U stated, and ref: Appreciate it much ! -P

BY the way, I'm trying this using C API interface ( no Obj-C tho ). We will have a launchctl based EP Security client, which we tested and seem to work fine ( note that we don not want any app related stuff, like canvas, delegates etc. ). At the start we will have a communication dylib that is going to field XPC based communication I mentioned here. This is gong to be C and C++. XPC module could stay as C module. Hope it does not create more problems !! -P

Nevermind, returning the pointer created to the class from return statement was actually the problem!!!