Whoa! You nailed it. Many thanks , this has given me headaches for a week. The culprit was a mod called "construction planner" . It did exactly what it should - but I didn´t think about it anymore. Must have added it only lately before I stopped playing the last time. Alt+C to approve sing...

Hi, it seems that my construction bots are not able to execute their duties. I have provided 2 screenshots, indicating the situation along with a save game. I have placed a ghost of a belt, next to a roboport and provided belts in a storgae chest, buffer chest and passiver provider chest. The roport...