Ace using wrong font / cursor position



Recently I booted c9 to see that it was using a non-monospace font, and thus my cursor position was incorrect. I looked at the other thread with this issue, to no avail.
This is what my IDE looks like:

These are the fonts in my font-family section:
Monaco, Menlo, Ubuntu Mono, Consolas, source-code-pro, monospace
I have tried resetting my settings to no avail. All help appreciated.


what browser and os do you use? this may be caused by missing system fonts, or a browser extension