Dygraphs - black areas / artefacts appearing for some users -

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some users experiencing black rectangles appearing in dygraphs, seem triggered hover events.

using firefox 38.0.5 on windows 64 bit machine.

i have latest version of dygraphs - v1.2

has else experienced , know of cure?

only become apparent, , users have been using graphs since 2011, guess may linked windows update.

thanks.


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