In mathoverflow I avoid asking questions and giving answers because the preview of mathematical formulas does not work: in the preview the formulas are shown precisely as I type them, with dollars and all. On one previous occasion I incurred a wrath of a couple of users because I repeatedly posted the answer I was typing, since there was no other way I could see what I was doing. For a while I thought I found the cause of the problem: replacing http in the URL with https seemed to help, since math preview worked -- alas, only for a couple of lines, then the math preview died on me. Since then I shunned mathoverflow like it was poisoned. I did look for an explanation and an advice what to do. The problem is not unknown, it seems. But nothing resembling an advice, which I found on the 'soft' part of mathoverflow, really worked. Can you help me here? I would very much like to be more active on mathoverflow, but this problem makes the site practically inaccessible to me.