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One of my vector layers is creating random-seeming lines whenever I pan across the map. It's only one layer and the lines disappear if I turn it off. It doesn't appear in the print composer so it isn't ultimately that big of a deal, but it makes me wonder if something else is going on. Pictures are below, taken after panning just a bit between each one. Final pic shows the fill color blurs along with the border.

first pic

second pic

third pic

fourth pic

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    Possibly related to this bug hub.qgis.org/issues/11441 – SaultDon Mar 9 '16 at 16:44
  • Yeah that looks like it. My artifacts aren't nearly as pronounced but maybe the layer just isn't complex enough. Thanks for finding that. – Brian Mar 9 '16 at 16:50
  • I had similar artefacts that did show in the print composer, and were thus a bigger deal. Turning off multi-core rendering didn't help; what fixed it was clipping the layer to some bounds just outside the area that I wanted to show. – Flyto Nov 25 '16 at 10:52
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Like SaultDon suggests, this is most likely related to a known error with multi core rendering: https://hub.qgis.org/issues/11441

The bug report has been re-opened. No solution but at least it's not a complete mystery.

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    Deactivating either OTF or parallel rendering should fix the problem – underdark Mar 9 '16 at 20:17
  • I'll give that a try next time I'm working. Thanks! – Brian Mar 11 '16 at 22:56

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