Issue with button icons in Spyder

[quadbox]

Hi all,

I've started having a problem with Spyder showing artefacts instead of icons for all of its ui buttons, as follows:

[img]http://i.imgur.com/4nwQBSZm.png[/img]

I've tried everything I could think of and cant work it out, it's not throwing any error messages, and this is happening on two seperate machines. Anyone able to shed some light on what might be causing this? I'm assuming it's either pyqt5 related, tornado related, or I'm missing some key icon set

Using Spyder 4.0.0_beta1, PyQt5 5.10.1-r1, tornado 5.1

[fedeliallalinea]

https://github.com/spyder-ide/spyder/issues/8748
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[quadbox]