Monarch 10 is limited to a 2GB table size by the JET technology underlying it. If your data loads in the table OK, which you can check by browsing to the bottom of the table, then it might be failing because you're trying to write beyond the limits of the output format. This might be 65,000 lines if XLS, for example. Monarch hanging on you instead of giving you a graceful error is what happens when you run XP software in an OS invented later. Monarch v12 supports larger data - it uses local SQL - and is available on a 15 day free trial should your budget be constrained.