I was looking at an .osm file in QGIS using the OSM plugin; I was specifically looking at a country's lines layer. When I checked the attribute table just after opening the .osm, everything looked okay. After I did an advanced search using the search query builder, the system was able to highlight all matches. Good. But, when I reordered the entire table by moving all selections to the top of the table, most table elements were converted to 'ERROR' (from their original values).
Has anyone here encountered something like this before?