I just ran into the same problem with Amazing Charts locking up, yesterday. Tech support was on my computer for about a half an hour and could not figure out why it was locking up. They ended up reinstalling Amazing Charts on the computer (a laptop, not the server). It might be best to reinstall AC. I am using version 9.4.3. I am awaiting formal release of version 10, before I install the upgrade.
Family Practice, FAAFP