I came across the same bug when I wanted to create an A0 poster with a blurred background and save it as 300dpi PDF. While other blurred objects appeared correctly the background disappeared.
To narrow down the bug I created a SVG with a blurred black rectangle in its center in the sizes A0, A1, A2, A3 and A4 and saved the respective files as PDF (see attachment). While the A0, A1 and A2 PDFs don't show anything, the A3 and A4 PDFs give the correct result.
Therefore I suspect the bug is caused when rasterized images get too big (that is, somewhere between 3508x4961 and 4961x7016 pixels). However it seems generally not to be a memory related bug, because when trying to save the A0 inkscape crashes with an memory error (see attached screenshot) while the A1 and A2 still get saved.
This bug occurred to me under Windows XP (Inkscape 0.48.0-1) and Mac OS X 10.6.5 (Inkscape 0.48.0-1).
I came across the same bug when I wanted to create an A0 poster with a blurred background and save it as 300dpi PDF. While other blurred objects appeared correctly the background disappeared.
To narrow down the bug I created a SVG with a blurred black rectangle in its center in the sizes A0, A1, A2, A3 and A4 and saved the respective files as PDF (see attachment). While the A0, A1 and A2 PDFs don't show anything, the A3 and A4 PDFs give the correct result.
Therefore I suspect the bug is caused when rasterized images get too big (that is, somewhere between 3508x4961 and 4961x7016 pixels). However it seems generally not to be a memory related bug, because when trying to save the A0 inkscape crashes with an memory error (see attached screenshot) while the A1 and A2 still get saved.
This bug occurred to me under Windows XP (Inkscape 0.48.0-1) and Mac OS X 10.6.5 (Inkscape 0.48.0-1).