I have an application which creates a single thread to connect to an MQ queue. It reads the messages on the queue one at a time, writing them to a file. When I run this on AIX 4.3.3, using JDK1.3.1, I consistently get a segmentation fault on the 150th message. I have no problems running the same application for 300 messages under Windows 2000. I've tried profiling it with JProbe, and there are no memory leaks. The application uses about 6Mb, and I've tried upping the heap to 96Mb with no success. I'm not really an AIX expert and none of the tools I have tried have been able to read the core dump file. Does anyone have any ideas as to why this might be happening?