Q u o t e: Hamachi isn't a supported program, that may be the issue.
True. I use Hamachi because of another issue. Battle.net does not support multiple players from the same IP in one game (see Blizzard faq/stickies from more official info on this), so I use Hamachi when I play 2v2 with my friends, two of whom live at the same apartment.
So, if Blizzard chooses not to support Hamachi in this new patch, I'm requesting that they fix Battle.net so that it will offically support multiple players playing in the same game from the same IP address.