IHMC CmapTools is written in Java. Compiz and Beryl are compositing window managers for many Linux distributions that use 3D graphics hardware to create fast compositing desktop effect for window management.
So, if Compiz or Beryl are enable and one runs IHMC CmapTools, the cmap editor window will be blank and it won't be possible to edit a concept map. In other words, CmapTools will open a window with no contents.
If you want to make the changes for all users put:
at the end of the /etc/profile file. You can do this by opening a terminal and typing:
sudo gedit /etc/profile
If you want to make the changes just one user put:
at the end of the ".profile" file in the user's home directory. You can do this by opening a terminal and typing: