Anki + Latex not working : I have installed BasicTex + dvipng
I found the answer here Anki+Latex. 

Basically you have to download this Anki add-on, which allows you to edit the path Anki uses to find latex and dvipng. Then you use which latex and which dvipng (on Mac terminal) to get the full path to each of them, and then you use the add-on to modify Anki's path.