Hello. I have an existing project which I have purchased may PCB's from. There has been no changes to the project or PCB but now on generating a gerber file to buy more PCBs if fails the DRC check in many places. It's also trying to add/update many resistors and many of the net PCB names appear to have changed. Other projects I use also seem to have inherited this problem. Please help as I have customers needed these boards. Thank you, Edward.