Hi all. It's been a while since I tried to create a new custom block based on an existing block, but when I do that now I can't for the life of me select the edges - only the drivable surface. Indeed, if I hide both the Geometry (Collisions) layer and the Geometry layer, I can still see the edges but can't select anything at all! I'm trying to create a partial block (e.g. a curve which is an eighth of a circle) so I need those edges gone ...

I expect I missed something in an update, and/or I'm being totally blind, but I'm completely stuck! Any hints please?

I think what you're describing is the clips of the block, which are not editable when you're editing a block as a custom block.

However, if you go to Item mode first, and then convert the block to an item, all parts of it will be editable.