pfSense

I had PPTP (server) working reliably under 1.2.x, but after Upgrading to 2.0.1 I can't get it working. I posted on the forum already about this (http://forum.pfsense.org/index.php/topic,51102.0.html)

After the vpn connection is established, I can ping the pptp client from a LAN IP, and vice versa. I can even access a LAN webserver from the pptp client, when the amount of data is small (very simple HTML page). As soon as I access a "real" HTML page, something starts to happen. The web page is not loaded. Pinging breaks at once. And strange log entries appear in the pptp log.

To my setup: I have two WAN connections, PPTP runs on the second one, which is the default gateway. I have two firewall rules for that interface, allowing PPTP and GRE (these rules are apparently not neccessary on the first WAN interface, probably added automatically?). Changing PPTP and the default gateway to the first WAN interface does not change things, that does not seem to be the issue.
I am using 192.168.4.1 as the PPTP server address, 192.168.4.96 for the first client address, all used IPs are in other address ranges:
192.168.1.1 for LAN
192.168.3.1 for WLAN
192.168.2.5 and 192.168.178.5 for WAN and WAN2 respectively (two separate DSL routers forward all incoming traffic to those addresses)

Have not changed IPs when upgrading from 1.2 to 2.0, everything worked nicely under 1.2!

Attached is a log file. Many lines like the following two are quite conspicuous:
pptps: [pt0] LCP: protocol 0x006f was rejected
pptps: [pt0] LCP: rec'd Protocol Reject #2 (Opened)