Comment 18 for bug 1110807

Ante, thank you that is helpfull information! Do you use a developer version of quantum or the regular install packages?
In any case, can you verifiy if all the ports received a unique ip-address? The difference in behaviour might be that postgresql might not allow the update of a record if the value was changed by another thread, and maybe mysql allows this. If so, a few of the ports will probably share the same ip-address.