It seems that beltbox technologies don't get icon_size definition.
For some reason it works ok until you install Bob's/Angel's mod set and Deadlock-Mod Integrations (and potentially Artisanal Reskins: Bob's Mods) after which it will fail on startup with icon_size being missing for basic beltbox (added by Deadlock-Mod Integrations for basic bob belts).
Adding icon_size = 128 to technologies fixes the issue.
