malcolmgin

I just tried your workaround, @hunneekim.

It does seem to work properly, even in the Post Subject, which Jetpack’s Beautiful Mathematics doesn’t.

I note that the rendering host for QuickLaTeX is http://i1.wp.com/ and any latex.php is accessed a different way from how Jetpack’s Beautiful Math does it (no sign of latex.php in the URL).

I’ve isolated this issue a little more. It seems that if the Chrome browser view is zoomed in or out less than 90% or more than 100%, the URL changes for the rendered LaTeX from, e.g., a working URL like: http://s0.wp.com/latex.php?latex=%2882%2C000%29_%7B10%7D&bg=ffffff&fg=000&s=0
to a non-working URL like: http://s0.wp.com/latex.php?zoom=3&latex=%2882%2C000%29_%7B10%7D&bg=ffffff&fg=000&s=0

Note that the difference here is the zoom=<number> querystring key/value pair. I assume the issue is part-Chrome and part-WordPress’s latex.php utility that’s running on s0.wp.com. Chrome seems to be inserting the zoom=<number> key/value into the querystring, but I note that s0.wp.com’s latex.php script is working for some zoom arguments, e.g.: http://s0.wp.com/latex.php?zoom=2&latex=%2882%2C000%29_%7B10%7D&bg=ffffff&fg=000&s=0