I found the issue. You can't use the route-lookup keyword if one of the interfaces is set to "any". This nat statement fixed the issue:nat (inside,outside) source static INTERNAL-SUBNETS INTERNAL-SUBNETS destination static VPN-Subnet VPN-Subnet no-pr...
I'm running into this exact same problem on a ASA 5525-x running software version 8.6(1)2The solution doesn't work becuase the route-lookup keyword doesn't exist. Example:nat (inside,any) source static INTERNAL-SUBNETS INTERNAL-SUBNETS destination s...