After replacing several resistors to accommodate a different footprint, I ended up with clearance DRC issues that I cannot clear. I imported the changes in the schematic to the PCB, deleted the old resistors, and placed the new ones. Is there a step I'm missing? There are actually no clearance problems on the PCB.
Information is a little sparse but...
If you have any copper areas, (copper pour, ground plane, etc), then you will need to rebuild them before getting an 'accurate' DRC.
There is a setting 'Rebuild Plane Automatically' in Setting > System Settings... > PCB (tab) but I've never witnessed this happen and so always manually rebuild them.
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Regards.