Comment 5 for bug 474341

I can confirm that there is a bug in this version of Convertall. The developer (http://convertall.bellz.org/index.html) has released a new version with a number of bug fixes.
If you are comfortable running the terminal, there is an alternative. Uninstall the current version of Convertall. Download and unpack the latest tar file from the website. Since the new package has the same dependencies as the current version, open a terminal and enter:-

sudo apt-get build-dep -y convertall
cd Convertall
sudo python install.py

This will install a working version of Convertall. In my case, Convertall was not shown on the menu, so I used the Alacarte menu to add it. The launch command is "convertall' and the icon is in "/usr/local/share/icons/convertall".

Hopefully, the new version of Convertall will be ported to the Karmic repos at some point.