To all who explained VLAN ID1 / Default VLAN to me: thank you, i'll have a second look at the configuration the comming week.
@cmb:
This isn't clear to me - does it just not work now that you added VLANs, or did the VLANs work fine in the previous version and when you upgraded they stopped working?
Its not that the VLAN's are not working, they are, its just that the PPTP clients are nolonger able to reach the LAN clients and servers… though after reading GruensFroeschli's reply about the tagged/untagged traffic problems he had i am starting to suspect that might be the case for this problem aswell... The pfSense port has been set to 'tagged' and the win2k domain is mostly on 'untagged' ports (as they would be using the default VLAN).
I'm going to play with the VLANs a bit more the comming week, i'll have a redraw on the network implementation and will give it a new go. I'll update this thread if it solved the problems we experienced or not.