Internet stops with PPTP VPN connections to ASUS RT-N66U VPN Router

I have a client with a small office network that has a few people working remotely from Windows 7 and 8 PCs. As an inexpensive solution the client opted to use a VPN router (ASUS RT-N66U) that supports PPTP so remote users could access the shared
files and SQL DB server.
The VPN connectivity for one client was working fine and then stopped working altogether so when the VPN connection is established all Internet and VPN access is stopped. This was especially troubling for me since I work remotely and cannot test or debug after
the VPN session has been connected. I checked the error logs and found nothing. Also there had been no new programs installed. And finally, I ran a full system antivirus scan with no issues found.
In case you are facing a similar issue, before trying something remotely that may not work, use the shutdown with reboot command in a COMMAND window and set a timer for something like 3 minutes to reboot in case you get stuck. (e.g. shutdown -r -t 180).
Problem: The two symptoms of the VPN connection failure are:
1) All Internet browsing stops working locally
2) No data can pass through the VPN tunnel
I created a virtual machine on my local network and replicated the client's environment. I experimented with nearly every setting in the VPN dialogue until and came to the final solution.
Solution: For the VPN adapter on the remote machines I configured DNS settings and used the remote as the default gateway.
* VPN adapter Networking IPV4 Properties for:
- DNS server 1: Main Office VPN Router IP Address
- DNS server 2: A public DNS server (Google is 8.8.8.8)
- I also checked the box to "register this connection addresses in DNS"
Note: Perhaps the local router would also have worked and DNS2 but I didn't test it.
I have documented this because after reading and searching among many Technical articles and the Microsoft support website, I was unable to find the solution that I came up with so I hope to help someone else.
Question1: - Can anyone tell me why the connectivity only works when 'use default gateway on remote network' is checked?
- I have disabled this option with some business class VPN routers and the connectivity still worked to the remote network but it does not work to the Asus router.
Question2: From the information provided can I determine where the problem lies?
Is it the:
1) Remote client PC
2) Remote client router
3) Home office VPN router (Asus RT-N66U)
If the true culprit cannot be determined yet, what steps do you recommend so I can isolate the true cause of the failure.
I appreciate any help so that I can be sure my solution is valid and pass along the findings to ASUS if it is their issue.

Thank you for the suggestion. I have successfully connected through the VPN router when the one client was unable to get VPN throughput working.
I looked at the routing tables with and without the VPN connection established. The differences are that:
1) when VPN is NOT active, there is a route from the local NIC IP to the Internet IP address of the local gateway
destination 68.109.82.xx
mask 255.255.255.0
gateway 192.168.0.1
interface 192.168.0.11
metric 21
2) when VPN IS active, the route to the Internet IP address of the local gateway is deleted and a persistent route to the VPN router local network has been added
Persistent route:
destination 192.168.21.0
mask 255.255.255.0
gateway 192.168.0.1
interface 192.168.0.11
metric 1

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