Interested bug discovered. When trying to call function on another machine server with CORBA::String in parameter or with returning function type CORBA::String we got segmentation (related to memory problems, probably when freeing memory as I can see from debugger output, but I don't sure). We run server on WinXP, VC6.0 SP5 and client on KSI Linux GNU.(callback CORBA method) -- Slava Garelin