i work with Instanced Static Meshes + Hierachical. Since 4.18 i have a Problem.
Imagine i create an Blueprint Actor and add an ISM. I save and compile. Now i create a Child Actor of my new created Blueprint. In Content Browser Preview Window everything looks fine, but as soon as i click on the child actor all ISM or HSM are not renderd. Not even in wireframe Mode. But the Array and Setup is correct filled (from parent actor).
the worst part is, that it happens also to and exisiting ISM Array. As soon you add something to array, all actor get invisible.
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There is an workaround, for the Child Actor Problem. (Thanks Irakli G.)
Just take the inherited Actor and add a new Instance to the Array. Et voilá they pop up again.
You can delete the new created instance again, after fixing it.