Wasn't there previously a 'Browse' button next to Output directory field in the Export JSON dialog? We've got some pretty long paths in that field, and it's kind of a hassle to navigate to the desired folder in Finder, then copy+paste the directory into the text field.
It looks like it might just be getting clipped out of the little dialog window. You can see about a quarter of the 'Browse' button's width on the Export PNG dialog, for example. I'm on a Windows 8 machine right now.
Is there a setting somewhere I don't know about, or is this a bug?
Attaching a screenshot