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I'm running OpenSesame 3.1.9 on OS X El Capitan, and with the xperyment backend selected the stimulus images don't show. They do appear, however, when using psycho instead. Why does this happen? How can I fix it? Thank you.
(it doesn't work with PyGame either, apparently)
Sorry, but I have no idea what the reason could be that the image doesn't show. But maybe you can avoid the problem. What image format do you use? There are some inconsistencies with those on some machines. You could try to use .jpeg (which works usually), or try some other.