End user getting problems with Storyline MacOSX with Safari

We have a Storyline 360 Users accessing a course on MacOSX/Safari and they say that the forward/next buttons don't appear, we have not managed to replicate as we do not have a MacOSX device with which to test it.  They tried it twice and got the same result. We do not see this problem on other devices and browsers Does anyone know if there are there any known issues with Storyline and MacOSX/Safari that might explain this behaviour?

All suggestions welcome and thanks in advance!

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