I'm working on a logo in Illustrator CC, and have a single letter (text) with 5 strokes, but for some reason there are random black artifacts/lines that appear in the stroke. I hoped it was just a preview issue, as the artifacts jump around as I zoom in and out. I exported a jpeg and the artifacts are in the exported image. Does anyone have a clue as to why this is happening?
When you say "text" you mean real text ? Or vectorize text ?
Anyway in some cases, font aren't perfect so you need to tweak them a bit. I think there's small gap in this font so I suggest you to save your style in the style panel, vectorize your letter, make sure everything is overlapping (where there was a wild stroke) and then une the pathfinder ton make one big ol' shape !
Them re- apply your style and you're done !
It's a typical GPU acceleration issue. Turn it off/on. If GPU acceleration was on and you had this issue, check for GPU driver updates. In some cases BIOS update also solves the problem.