icons after upgrade to 2.3.4

[TomCann]

Have upgraded to 2.3.4 successfully as far as I can see, but one odd thing is the small boxes appearing next to some icons. I'm guessing it is something to do with fonts, but really don't know and would appreciate any tips. This is a screen dump from Firefox, but tested under MS Edge and it looks similar.


icons after upgrade to 2.3.4

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