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Sorry, I don't know what's causing this problem. If anybody has any ideas, please let me know.
For now, my "solution" is to to have the "(Re)process math" link under the tip in the dashed box in the right hand column and hope that the problem goes away when we switch to MathJax. If there's a more convenient place for the "(Re)process math" link, I'm happy to move it.
Like James, I've only started noticing this problem in the last couple of months. Most of the time (maybe 95%) it displays fine and I don't have to reload. I'm using an ancient version of Firefox.
Installing the recommended fonts did NOT solve the problem for me. But it is possible (I'm not sure) that it made it less frequent.
I like Dror's suggestion. It should be easy to implement and may be a hackish but effective solution for a lot of people.