I downloaded OSM map for an area and run Valudator. It reported number of conflicts. I clicked Ignore to deal with them later, and now, when I run Validator again I cannot se those conflicts any more. Thez do not show even if I repead conflict examination.
I found it at “C:\Documents and Settings%User%\Application Data\JOSM\validator\ignorederrors”. Renamed it, restarted JOSM, and validation errors are again shown.