I am a new user of QGIS 1.8.0. I do not display correctly SHP layer. When I want zooming layer so that half of the layer is outside the map window - display layer disappears. In the settings I can not find a way to stop this. SHP layer is visible only when the complete layer fits in the map window.
The problem is solved. Viewing layers functioning incorrectly in layers containing. Qix file. If I leave only at layer shp, dbf and shx everything is fine. Qix I have to delete all the layers are displayed well.