Strange networking routing issue in Windows 8.1 VM in Fusion 7

Hi,

I"ve just upgraded to OSX Yosemite Public Beta 5 and now I'm getting a very strange routing issue in my Windows 8.1 VM. The VM in question is set for bridged networking and I have a site to site VPN setup on my Cisco router to my work place. Since the upgrade I'm unable to connect to devices past my work place router i.e.:

192.168.1.1 (My Home router) -> site to site VPN -> 10.6.1.254 (My work place router) -> 10.6.1.x (Work place internal LAN)

I have a Windows 7 VM setup the same way with bridged networking and I'm able to contact devices on the work internal LAN with no issues.

Just to confirm that before the public beta 5 upgrade the Windows 8.1 VM was able to contact devices on the work LAN.

Any ideas?

Thanks

Simon