After installing this driver i started creating the vlans: 2 tagged vlans and 1 untagged vlan.
the untagged vlan is out primary vlan used to connect to our servers and internet.
This primary vlan didn't seem to work properly.. I could connect to the internet but not to all local servers.
When looking at the traffic flow on the server i was connecting to i saw traffic being send from the interface and toward the interface but it never reaches the browser. when reverting to version 18.8 it all started to work again.
further it is a pain to find a place where to file a bug report on this site..