By default, `Realtime DRC` runs in EasyEDA all the time as you work on the PCB layout. ![enter image description here][1] This will show errors as they occur while you are routing and moving components. You can also check each DRC error in turn by clicking on each error after clicking on `Refresh` in the Design Manager: ![enter image description here][2] If you untick `Realtime DRC` then you will need to manually check each error in the Design Manager in the same way. [1]: /editor/20160428/572124c53145d.png [2]: /editor/20160428/572125974871c.png

Thanks. I should have had auto DRC turned on all the time.