Currently it is not possible to use \overarc with <math>. But it seems \overarc is a standard LaTeX symbol. So no idea if the problem comes from AMS-LaTeX or elsewhere.

An acceptable workaround for the moment is to use \overset{\frown}{AB} instead.

PS and off-topic: It took me some time to find out this "Math (texvc)" component in this product. I was looking for AMS-LaTeX in other product.

**Version**: unspecified

**Severity**: normal

**See Also**:

https://github.com/mathjax/MathJax/issues/567