(Apologies if this has already been discussed. I searched the archive and bug reports and did not find anything related. Perhaps I didn't search well enough.)
I'm using LyX 2.1.4 on Fedora 22 (4.3.4-200.fc22.x86_64) with instant math preview on. After editing about a page of maths formulae, the instant preview will start displaying "random" previous formulae instead of the correct ones. When I go inside the formula, I can edit the correct one, so LyX has the correct one internally. The problem goes away if I close the document and reopen it, but after about another page or so of editing, the problem reoccurs. I'd be grateful for any advice on how to solve this. Best wishes, Alexander
