All the running terminals remain operational, I just cannot open any new ones. If I close them all, I can usually re-open several of them, but never as many as I had to begin with. At that point the system seems to have decided on a set maximum; every time I close a terminal, I can open one, but I can never again go beyond the arbitrary max.
Other terminals will spawn fine: I can still run new instances of git/bin/bash.exe, as well as cmd. It's just git-bash that borks. I've tried running from the start menu, explorer and from bash with the same result.
Obviously a fix would be awesome, but I'm more than happy to settle for a work-around that doesn't require a full tear-down and re-build of my development environment. At the moment, the only way to get back up and running is either a full reboot or a re-install of git.