I have a simulation program that I am running under various conditions.  It has worked for all but 8 conditions.  The only difference in these 8 is the IP size is set to 4 versus 3 or 2.  It runs through the program through the 500 data sets I have generated when IP size is set to 2 or 3 and does so in about an hour.  When I change IP size to 4 it gets stuck in the data step and I have to stop it.  I have let it sit for 24 hours thinking it was just thinking. It never completed.  I have 1,000 observations in each of my 500 data sets.  I broke those into data sets containing 100 observations thinking this would help but I am having the same problem, it will run through some of them and then hang in the data step on random data sets.  No errors or warnings are being produced in the log.  Not sure what I need to do to get this program to run.  The program has nested loops but it has worked previously for the IP size conditions so I know I am not missing a semicolin or end command. ... View more