we have experienced the same "maximum users" error message with only a few users in . We have 30 normally available. When it happens there is a small window that the user can reboot & go back in. If anyone else tries to access then all are hooped. we then just rename the EZSEMTAB.dat file & we are good to go again. with 4 locations it is a pain in the butt to get everyone out. I have just been waiting & expecting the cure to be in the next upgrades or service packs. We have encountered this about 4 times in the past 6 weeks so not brutal & we know how to fix it... just a pain.