I was already aware that the 2.0 beta had broken the axis labels (Battery and Power level labels missing, and Time labels shifted to the right).
Unfortunately for me, the 1.0.8.4985 update that just came out has the same new Flash and AIR versions, and breaks Battery Guru in the same way.
I'll have a fix out shortly. Until then, please just note I'm aware of the issue and don't need a mass of bug reports (or bad reviews ;-) ).
Thanks!