Q:

MathJax in the Android App

Has anyone else noticed issues with MathJax in the StackExchange app? I'm aware the comments and titles don't render MathJax automatically, but I've also seen questions where certain math expressions lead to error messages in questions. The most recent and frequent example I see not rendering is \dfrac (for a recent example, see MaxW's answer in the edit history). 
Edit: To clarify, I'm seeing these errors for the Stack Exchange Android App Version 1.0.89

A:

Unfortunately the app uses a different version than the website. That does include the recent updates to mhchem, especially the \pu{...} command. 
While \dfrac can and should be avoided in general, that is not really true for the mhchem updates, as we would lose all the recent development discussed on meta. 
We'll have to see and wait how the developers will continue their work on the app.

