Hi, We got a bug report at Debian [1] regarding the route option. It turns out that if a route added by openvpn is later modified (removed and added to other iface), openvpn will modify (delete) the later one.
As the bug submitter states, maybe openvpn should specify the device it wants the route deleted from. [1] http://bugs.debian.org/251304 -- Alberto Gonzalez Iniesta | BOFH excuse #263: agi@(agi.as|debian.org) | It's stuck in the Web. Encrypted mail preferred | Key fingerprint = 9782 04E7 2B75 405C F5E9 0C81 C514 AF8E 4BA4 01C3