That's usually a sign of something rewriting your HTML using strings instead of DOM methods. For example, if you do document.body.innerHTML += 'foo' the whole document (well, the whole body) will get trashed and rebuilt. Canvas graphics are not stored in markup, so the canvases lose their graphics (because, technically, they're brand new canvases). Please check if you can find something like this from your code, and send me a link if you can't.
Simo
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