Game version is Dev Branch version 1.05.111.807. (The 04-11-2013 update)
When using the sector modules after today's dev branch update, (which changed the representation of sector modules on the UI from the side flag to the faction flag). You end up with the sector icons being filled with squares of the colour of the side instead of the flag of the faction. The sector identifier is still there and everything, however the flag is not.