Hi, I'm using boost-1.39.0 with openMpi 1.3.2 on OSX 10.5.7. I'm getting some strange behavior when sending and receiving a vector of pointers between processes. The received pointer addresses are sometimes invalid. I'm not using the skeleton content code, just sending and receiving the vector. Some output: [2] processing edges from 1 [2] unpacking edge 0x834810 [2] unpacking edge 0x834810 [0] processing edges from 2 [0] unpacking edge 0x834ec0 [0] unpacking edge 0x834ec0 [2] processing edges from 3 [2] unpacking edge 0x8346c0 [2] unpacking edge 0x8346c0 [2] processing edges from 0 [2] unpacking edge 0x1 [2] unpacking edge 0x1 The hex value is the pointer address, and obviously doing anything with the edge with the weird address causes the app to crash. I can't see that I'm doing anything wrong (although of course that's a possibility) and so I thought I'd run the boost mpi tests. The skeleton_content_test fails consistently with the following output: Broadcasting integer list skeleton from root 0...OK. Broadcasting integer list content from root 0...OK. Broadcasting reversed integer list content from root 0...OK. ../../../boost/test/minimal.hpp(123): exception "memory access violation at address: 0x974bfd1c: non-existent physical address" caught in function: 'int main(int, char**)' **** Testing aborted.../../../boost/test/minimal.hpp(123): exception "memory access violation at address: 0x974bfd1c: non-existent physical address" caught in function: 'int main(int, char**)' **** Testing aborted. **** 1 error detected ../../../boost/test/minimal.hpp(123): exception "memory access violation at address: 0x974bfd1c: non-existent physical address" caught in function: 'int main(int, char**)' **** Testing aborted. **** 1 error detected ../../../boost/test/minimal.hpp(123): exception "memory access violation at address: 0x974bfd1c: non-existent physical address" caught in function: 'int main(int, char**)' **** Testing aborted. **** 1 error detected ../../../boost/test/minimal.hpp(123): exception "memory access violation at address: 0x974bfd1c: non-existent physical address" caught in function: 'int main(int, char**)' **** Testing aborted. **** 1 error detected **** 1 error detected ../../../boost/test/minimal.hpp(123): exception "memory access violation at address: 0x974bfd1c: non-existent physical address" caught in function: 'int main(int, char**)' **** Testing aborted. **** 1 error detected I'm not sure if this is related to my problem but the memory issues made me wonder. Any help is appreciated, thanks, Nick