Hi, folks. Relative IDL newbie here. I am using code (not written by me) using the split_for.pro routine for multi-threading: http://sciama.pbworks.com...ing%20IDL%20routines The code runs fine in single-threaded mode (bypassing split_for), but does not run in multi-thread mode. What is particularly frustrating is there are not obvious errors on the console. I think something is going wrong within the child process, but the error seems to be invisible on the parent process console. I suspect the error has something to do with my environment, but can't say for sure. Any tips on debugging this? I have spent many hours working with it with no luck. Failing that, any suggestions for a consultant that might be able to work on it for an hourly fee? Thanks.