Participants not visible to (some) users

We have a Jitsi installation (dedicated VPS) where we have recently started noticing some rather odd behavior. The moderator/host cannot see/hear all participants, but all other participants can see and hear each other. If everyone leaves and then re-join the meeting, all is well.

I can’t quite put my finger on any pattern, like server load, time of day, nor number of participants.

Has anyone else seen this?

Is this an up-to-date installation or an old one?

Are there more than one JVBs?

It’s on 1.0.4628. Only one JVB.

This may be an already fixed bug. You can try to install the current stable version.