Fritzing doesn’t support (nor will it render AFAIK) gradients. It only supports the Svg tiny subset. The svg needs to be saved as plain svg in Inkscape as well and it needs a single group enclosing the entire svg with the label breadboard. This is a corrected svg which may work better. If it doesn’t upload the .fzpz file of the part from the parts editor by Fie->save as new part (upload is 7th icon from the left in the reply menu) and I will have a look at what is going on.
(to download the svg right click on it and select save image as.) Note I ran this svg through FritzingCheckPart.py in order to remove various things Fritzing doesn’t support (mostly px in font-sizes but other things as well.) This tutorial may help you as well:
Peter