Hello (and sorry for my bad english, im french...)
I have the same problem ... See my OpenVPN server configuration :
I'm on local network 10.187.91.0/22 and i create this VPN on this network. I have a local network 192.168.1.0/24, and I want to access to it with a VPN.
With this configuration, I can ping my VPN Server with the address 192.168.1.254, but not the rest of this local network (192.168.1.245 for exemple...)
This is my rules of my firewall :
WAN : UDP * * * 1194 (OpenVPN) *
LAN : * LAN net * * * *
So, it's a problem ...