LaTeX preview problem

• LaTeX
I've been having severe problems trying to get LaTeX expressions to look right using preview -- it seems that only the initial processing run sticks, any corrections made don't seem to register, at least until I post the thread (everything looked fine then). The issue is persistent across Firefox and Internet Explorer, however, both at least seem to get one independent run each -- so I can write something in FF, preview and correct, then copy and paste to IE, check again; however, any subsequent changes don't seem to stick. I have even logged out, closed FF, and logged in fresh, to no avail. Looking around, I saw the problem discussed https://www.physicsforums.com/showthread.php?t=273819", but no solution was offered.

Basically, the problem is, if I write something, containing an equation, then preview it, see a mistake in the equation, correct it, and try to preview it again, instead of seeing the corrected version of the equation, the old one will continue to be displayed; and even weirder still, when I go and enter a new equation before the original first one, it seems as if the output is just 'moved up' one place: where the new first equation should display, the old equation one turns up, etc.

Of course, I can always post uncorrected and edit, or check every equation with the LaTeX preview, but both solutions seem somewhat tedious -- of course, if I have to live with it, it won't kill me. But is there some better way of dealing with this? Is anybody else experiencing similar troubles?

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phyzguy
$$e^{i\pi} + 1 = 0$$