The referenced ticket suggests this is most likely the result of fontconfig misconfiguration but I don't see an offending config in ~/.config/fontconfig in my 2017.01.01.0 install.

I had to create a font.conf in /etc/gimp/2.0/ just so I can get back to work, still not sure what caused it. I have no offending config either.

Unable to reproduce this issue. Can you confirm whether it still exists on a fully upgraded system or via a fresh install of Solus with a 2017.04.18.0 ISO?

On my fully upgraded system without that font.conf I still get the issue. I'd test on my laptop but I seem to have a separate issue on that.

Tested on my laptop same issue.

I have the same issue. The workaround is to create ~/.fonts.conf containing

<fontconfig>
 <match target="font">
  <edit name="rgba" mode="assign">
   <const>none</const>
  </edit>
 </match>
</fontconfig>

Found this solution here.

Can this ticket be closed ?

The issue is still present.

This seems to be finally solved. I cannot reproduce it anymore.

I can still reproduce the issue on a fully updated Solus 4.2 system.