Hello Riva,
I am facing a similar issue. Some icons are not visible. For example the "cancel" and "clear" icons are not visible. In the below screenshot you will find that even though the igx-icon element is present the icon is not visible.

If I manually edit the icon label – "cancel" to "close" then I can see a relevant icon (below image).

I think the icons are not downloaded properly which is leading to this issue. Maybe I missed a step while upgrading to angular 16 from 13. Any suggestion is highly appreciated.

Changing css will not work?
If row colors do not change I will have to use the default pink on row click? Can I not inject themes?

Hi Martin,
The custom template is not getting displayed if I manually change the "isLoading" property of Ig-Grid. It is showing the default spinner. is there any way I can manually control the flag to show my custom spinner?