We can see holes in “black color” in the Tekla model. This is the default hole color in Tekla. We can modify model background color in advanced options. So if you change ‘black’ or other dark colors, it’s difficult to view hole mark properly. Please set value on “XS_VIEW_FAST_BOLT_COLOR” in advanced option as 1.0 1.0 1.0. Reopen your views and you can see the difference.