Stimuli appearing strange, broken with green lines

Hi!

Here the solution:

Try to add the argument multiSample and numSamples when you create your window, as in the example below:

w = visual.Window([wstim, hstim], color = [0, 0, 0], units = “pix”, fullscr=False, multiSample=True, numSamples = 16).

In my script this worked fine.

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