After Implementation, the "DRC Violations" area in the Project Summary shows that there are DRC errors but there are no errors in the Messages window.
Where can I find the DRC error?
Design Rule Check (DRC) is automatically run during the Implementation process.
Some DRC violations, even errors, do not stop Implementation.
These DRC messages are not shown in the Messages window, instead they are prompted in the DRC Violations area in Project Summary.
To check those DRC Violations, run DRC from "Tools -> Report -> Report DRC..." in the Implemented design.
The DRC messages will be included in the DRC result.
Starting from 2015.1, the "DRC Violations" pane will be removed from the Project Summary.
All DRC violation messages will be included in the Messages window.