SOLVED: Can't see other clients in the "cast to" devices list

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Are all the clients on the same subnet/VLAN?

Yes, all on 192.168.0.0/8 subnet. I don't have any sort of special vlan stuff.

Is your router blocking broadcasts?

I don't think so. It's some Hitron ISP router/modem. I checked the firewall settings, this is what it says:

Code:

Minimum Security (Low):

No application or traffic is blocked.

Allow (LAN-To-WAN):All

Blocked:
IDS enabled
IDENT (port 113)

If there's some test I can do (nmap?) to confirm, please let me know.

Are you logged in as the same user on all devices?

Yes, both JMP clients are logged in with the same client.