QuantumGIS 2.6.0 (Windows 7 64-bit)
I have created a PostgreSQL POLYGON as WGS84 (CRS EPSG:4326). The polygon is a series of points around (but not actually on) the edge of the map. This is a rectangle (see the first image below).
POLYGON((-179.9 -89.999,-179.8 -89.999,-179.7 -89.999...), 4326
I have changed the CRS 'on the fly' to World Robinson (CRS ESRI:54030). In the previous version of QGIS this would now display my polygon as the racetrack shape of the Robinson projection. In QGIS 2.6 the correct shape is only displayed when I toggle 'Toggle Editing'.
I believe that only the extreme points are being displayed, until I toggle editing, when it is using all of the points. I have also observed this behaviour in linestrings.
Why is this, and how can I get my desired behaviour? Any help gratefully received!
Update The polygon starts to render correctly as you zoom in.