After replacing FBCA with KTX for the local server a couple users have reported getting "loopback: print: server is full" error when trying to start a local server. This seems to be due to maxspectators getting reset to an empty string "" when doing /map dm4 for example. FBCA didn't behave this way, it kept the maxspectators value it had before /map dm4.
Can make things work with /spectator 1 and /map dm4 again but would be nice to figure out why this is.
As a workaround I've added /spectator 1 in autoexec so it at least works after an ezQuake restart.