Comment 3 for bug 538749

1) Could you attach the missing linked bitmap in the upper left corner of the SVG document if it is important to reproduce and compare the result with different versions/platforms?

2) When I tried to export your attached file (as is) to PDF - Inkscape almost brought down my system (using all resources it could get) and I finally decided to force quit it (Inkscape 0.47+devel r9191 on OS X 10.5.8, Cairo 1.8.10)
Could you please attach the original SVG file you used to test the differing output depending on the alpha value for the radial gradient as well as the exported PDF file?