VLAN VID won't change on AC87U with Merlin software (Beta2).

Hi,

I've got the following problem. I'm trying to change the VID of the internet VLAN at LAN - IPTV, but everything I do it won't change. When I choose a a pre specified option it changes them (but that's mostly lan 3 and/or 4) but when I choose manual and try to change the internet vlan it won't sitck to 6. I've tried rebooting after changing but nothing works.

Does anybody have a clue or an idea how to fix this?

Thanks in advance.