We're also facing this problem. Since Visio 2013 drawing control has a lot of issues, we can't provide support for Visio 2013. All of our clients have to use Visio 2010 / 2007.
Potential new clients, not having Visio installed, can't use the Visio 2013 demo.
But Visio 2010 demo is not longer available.
How can MS can help us out of this situation?
Regards
André