When trying to upgrade to 0.8.x, I noticed that it sometimes omitted the dividing lines for \frac and the overhead lines for \sqrt.

Here's a test file showing the problem (for dividing lines): https://rawgit.com/akalin/60e78169d60908f8111652540f427607/raw/f53ae1650b12bf6db46b264e8852ded3d82ca7e7/test-0.8.2.html At default zoom, the dividing line for the \fracs in the 2nd expression isn't visible, and if you zoom in and out, you can make one or more of the lines disappear.

Here's the same file using 0.7.1: https://rawgit.com/akalin/60e78169d60908f8111652540f427607/raw/f53ae1650b12bf6db46b264e8852ded3d82ca7e7/test-0.7.1.html If you zoom out far enough, the lines do disappear, but it seems somehow more robust then 0.8.x.

I suspect that the problem isn't unique to 0.8.x, but the change in rendering the superscripts exposed it.

Gist for the test file using other versions: https://gist.github.com/akalin/60e78169d60908f8111652540f427607