Just tested that latest build and the issue persists, as well as my other problem with the double accent mark thing.
This is a bit annoying since the key will change to the sg tool no matter what. I mean, I click on the artboard with the type tool and start typing and then press the numerical '0' key, it'll activate the sg tool. No need to be in a 'non-active state' to get this behaviour (I hope that phrase makes any sense).
About the add-on software, I don't know, I don't think so... I don't even have installed the crappy software that comes with logitech keyboards and can't think of anything that may interfere with it... And then again, note that this doesn't happen with sg v2.5.030 (latest build I downloaded prior to 2.7)
weird :D