Fonts not loading (icons are empty squares)

[iwoj]

I'm in the process of updating an old meteor app from 0.6.4 to 1.4. Everything is working now except for font-awesome. I've removed the old font-awesome library and tried installing natestrauser:font-awesome and fortawesome:fontawesome (not at the same time of course), but all I get are empty squares where icons should be. It looks like the fonts aren't loading, but I have no idea why that would be the case. The font files seem to be in the app build.

Here's an example of one of the icons in use in my code:

Looks ok to me. Any idea what I might be doing wrong?

@dandv

[clarkritchie]

I am seeing this, too, but only in some circumstances, such as in a Bootstrap collapse.