We have multiple people at our site testing Azure via separate accounts (MSDN subscriptions). Each are using test machines on the same local subnet. One was able to create a site-to-site virtual network and can access machines across this network in both directions. A second user went through the process of creating a virtual network, and worked with IT to get our VPN device configured for this connection. That tunnel appears to be good from an IT perspective, though this second user cannot access any of their machines across their virtual network. The network configurations of each user was exported and compared, and they are pretty much identical.
Is there a limitation on the number of virtual networks that can be created from a single site? Is there any way for multiple users with different subscriptions to share the same virtual network?