Comment 5 for bug 1246015

It's hard to reproduce but there is definitely something very wrong with undo in such cases - in my other file when I hit undo after using one of those effects there is no crash but two other groups become invisible - their opacity is still 100%, they can be selected (but only by drawing rectangle - not by clicking) and only way to make them visible is to use CTRL+SHIFT+Z or just use one of the collor effects again.

I've managed to make SVG out of it that doesn't contain anything copyrighted (apart from the yellow tile, the copyright is mine) - select the yellow tile and use Color -> Less Saturation. Then hit CTRL+Z - the witch and the net both disapear. What they share is they both use clipping.

I will try to create a file that doesn't have copyrighted images and crashes in such cases. It happened to me on different files that were making the whole Inkscape VERY slow because of lots of gradients.