![Mac Missing font](https://i.stack.imgur.com/I1KAo.png)

Since changing my Mac's font from the default on Yosemite to San Francisco (the font on the Apple Watch for those who don't know) my Mac's password dialog box has always appeared like this. It still works once I type my password in, but it's slightly annoying.

Would anyone have any suggestion on how to fix this? Cheers!

Mac OS 10.10.3.