Reference Set Selector Icon not Showing

I have an issue with mendix 10.1.1, when I add s reference set selector the right icon doesn't appear in the page. I have provided a screenshot below. Does anyone have a solution to this?.  
1 answers

Also checked if your atlas_core is up to date?

Also check your stylesheet in the inspector if the background image is set:


it loads a svg image as background image. you could also check if this image generated a 404 in your console or network tab of the inspector.


But with an up to date atlas I assume it should be there, if it isn't there is probably some styling that overwrites the background-image