Open Sans is a horrible font, is there any chance that you could change the default font to something even remotely better? It is SO narrow and small, it's nearly impossible to read at normal sizes.
Further, it does not look the same in the editing mode as it does in the preview/run mode, which means you can't really plan spacing well.
We are considering more options for fonts. May be web fonts, so that when the prototype gets shared, users will also be able to view the correct font if they don't have it installed. However, depending on the browser used, there may be some differences in the font rendering.
Can you expand on what you meant by narrow so that we understand the issue like you do? Is there a better font we should consider? We haven't noticed issues with readability when testing prototypes here, and that may be why we were unaware of any font readability problems. But then no prototypes are alike, and you may have specific situation that we should follow up on.
Here's what it looks like (Macbook Pro on 27" retina display):
Here is the font in edit mode (and, what it is 'supposed' to look like in normal use):
Thanks for clarifying, Mike! That looks like a bug for sure, coz what you are seeing is definitely nothing like Open Sans. Merely from the looks of it, the normal style is not rendering correctly. Bold and italics is fine. Is there any way you can send us an affected file?
Someone from support will follow up on this so that we can diagnose what's causing the bug. Thanks for bringing it to our attention.
I don't think it's unique to Indigo. Take a look at the attached screenshot (link), here. You'll see the same problem. This happens pretty much anywhere someone's using open sans.
We will research this a bit. Just to check, is everything looking fine for you on this page? http://www.google.com/fonts/specimen/Open+Sans