Now I'm really curious, if this was something blizzard did against dual boxers or was for something else and messing with HKN was a coincidence. I do hope they did not do a BAN against dual boxers, all they do is change the EULA and TOS(Yeah, we all read this) and BAN.
Ummm... no. They have publicly defended multiboxers and multiboxing in general.

Chances are they changed something trivial, and it just happened to affect the way you guys use HotkeyNet. Do note that it's just HKN users having trouble -- not any other software. If they wanted to take action against multiboxers, this would be one of the last -- and least effective -- changes they would consider