Thx, for you reply!
But maybe, there is an misunderstanding or I did not understand… ;-) I think the GWs in "System > Routing" have nothing to do with this problem.
It´s about the DHCP Server "Services > DHCP Server". I have three Networks. Before the update, I left the Gateway field blank.
The default is to use the IP on this interface of the firewall as the gateway. Specify an alternate gateway here if this is not the correct gateway for your network.
After the update, devices did not get a standard-gateway via dhcp. So, I had to put the interfaces IP to the Gateway-field to get dhcp working.
Thx!