I think it is because of wmb format. but don't know why it worked before compilation... because as I know, all entities within a level created of the same wmb map entity, or model, share their textures by default. you can use ent_clone to make each created entity unique after ent_create, but it makes slower the rendering, and increases nexus very much. imo it is more desirable to use different models or wmb map entities for each different tiles.