Yesterday I was trying to add something to a Gif file using Inkscape. Some how I managed to get some SVG data on the GIF file, which caused the Nautilus window manager to die and for some reason I couldn't delete the file through the GUI. I did manage to delete the file with the terminal which fixed the problem though, using the following command.
$ rm /home/stuart/Pictures/file.gif
I'm going to try manipulating the file again, hopefully with better results this time.