Update on previous bug reports as of beta 6.
@dae, here is an update on previously outstanding problems with the MathJax preview.
This is fixed.
This hasn’t been fixed, yet. It wouldn’t be so bad if equations were shrunk to fill the entire width of the text box, but they instead shrink to fit the minimum width (that is, the width of the text box when the window is resized to its narrowest allowed width).
This hasn’t been fixed, yet.