[Vpn-help] Connection error, 2.1.5 rc2 on Win7 x64

[Aristomenis Pikeas]

Trying to use the client for the first time, on a clean Windows 7 RC1
x64 installation. I'm connecting to my work network, where I'm running
a Cisco ASA 5510.

The client gives me an "invalid message from gateway" immediately
after "bringing up the tunnel". I don't see any log files in the debug
directory.

Please let me know how I should go about troubleshooting this.

Thanks,
Aris