Hello everyone, I've been having this problem since December 2007 last year. I recently migrated my AC database to a brand new computer (not a server but we called it the MAIN computer). Although AC freezes not everyday but at least once a week or sometimes twice a week. So it happened again this morning. The strangest thing is when AC hangs (on my laptop), I immediately checked the MAIN computer and tried to open AC from the MAIN PC, it didn't open (it will say not responding). The only way to get back on AC is to reboot the MAIN computer. Then all the workstations will be able to reconnect. Does anyone has such problem? Many thanks in advance...