Adobe Illustrator Glitch on Mac

[Tasmin]

I have recently been using Adobe Illustrator on my Mac book for fashion design however there has been a constant glitch when using fill colour or just even lines to draw things. The will appear with moving white lines that change when I zoom in and out. When converted to a PDF the document appears how it should but it is hard to work with within illustrator. 

[Monika Gause]

Try and turn off the GPU acceleration in the Preferences.