I'm not sure if this is something browser-specific that C2 can do anything about, but I've noticed the following:
The font size of buttons and textboxes always stay the same when changing the scale of the layer (zooming). The size of the object itself is changed, but the font size is always the same. Shouldn't the font size be scaled accordingly?
I've tested in Chrome and IE9.
https://dl.dropbox.com/s/uczs8hoxcw6kgy9/buttonfontscale.capx?dl=1