When installing custom shapes into their correct folder and re-start Asset Forge I get this error "Caching thumbnails (98%)..." - with that Asset Forge hangs and has to be force quit.
How can this be fixed?
Create your own 3D models and 2D sprites! · By
This one, here from the forum https://itch.io/t/118837/antique-structure-blocks)
I also tried to remove all the files that are not obj or mtl. no-go... :-(