[Mathias]

There is an optional rule you can turn on from the Settings menu in the Tactical Console that switches it from the default (roll initiatives once at the beginning of combat) to a house rule (roll new initiatives every round). It's Settings...Roll Initiative Every Round, but I just tested without that setting turned on, and my combatants maintained their initiatives when I went to the next round, so if you weren't using the Roll Initiative Every Round setting, we'd appreciate more information on how to reproduce this issue, so that we can determine if there's a bug that shows up in a rare set of conditions.