Can't access internet from LAN after intial setup

Hi

I have problem...

I setup my new XG 125 today and set everything up, I connected the modem to the WAN and my computer to the LAN port of the XG.
Now everything worked, I could surf etc.
The initial setup saddly made a bridge out of all ports. I deleted that bridge and configured Port 1 as LAN:

But now I have network access, but no internet acces?

What could be the reason for this? I changed nothing else.

Also the default rule should allow the LAN to access the internet, as I think...

The packet capture just shows me "Violation" as the error, but nothing more:

Regards
Luca