Slider radio labels showing up as blank

URL of experiment:

I have a radio slider for which the labels don’t show up for ~10-15% of participants (the radio buttons are visible, but not the labels, so all participants see are 4 dots). I am not able to reproduce the problem on my computer using google chrome (version 85.0.4183.83, Windows 10). The issue seems equally likely on Mac and Windows. The code for the radio slider is below:

mancheckSlide = new visual.Slider({
    win: psychoJS.window, name: 'mancheckSlide', 
    size: [0.01, 0.3], pos: [(-0.4), 0], units: 'height',
    labels: ['d) To receive double compensation for my participation','c) To recommend the study to a friend','b) To continue for an additional 5 minutes','a) To continue for an additional 20 minutes'],
    ticks: [1, 2, 3, 4], 
    granularity: 1, style: [visual.Slider.Style.RADIO], 
    color: new util.Color([(- 1.0), (- 1.0), (- 1.0)]), 
    fontFamily: 'Arial', flip: true, bold: false, italic: false, 
    fontSize: .05,


Hey man, I’ve been running into this problem too. My laptop and most other machines run the code fine, but my desktop shows no text and just black radio dots. I played around with resolution settings and had no luck, did you manage to solve the problem?