GS748Tv5 VLAN hosts can't communicate

Question

GS748T v5 Software version: 6.3.1.47&nbsp;I can't get any VLANs (except VLAN1) to allow communication between hosts on that same VLAN. I used this guide originally:https://kb.netgear.com/31026/How-to-configure-a-VLAN-on-a-NETGEAR-managed-switch&nbsp;I was able get the hosts to communicate when I followed this:https://community.netgear.com/t5/Managed-Switches/GS748T-v5-VLAN-problems/td-p/500289&nbsp;Set PVID = 100 to ports 1-24 (untagged) for VLAN 100.Set PVID = 200 to ports 25-46 (untagged) for VLAN 200.Leave PVID = 1 to tagged port 48 for all VLANs &nbsp;Can anyone tell me why I have to have VLAN 1 Membership set for other hosts in VLAN 47 to communicate with hosts/ports in that same VLAN 47? If I remove the "U" from VLAN 1 (while "U" is set for VLAN 47) for ports 46, 47 and 48, the hosts plugged into those ports can't communicate with each other.&nbsp;Hosts on VLAN 47 are 172.16.47.0/24 and I just migrated to this GS748Tv5 from a Cisco switch with the same VLANs setup and working.&nbsp;Screenshots of configuration that works, but why is VLAN 1 needed for 47?&nbsp;&nbsp;&nbsp; &nbsp;