The next version later this year will be the first stable version of the V3.
This version change the location of the configuration files.
For Windows this is now %LOCALAPPDATA%\Skychart and for Linux ~/.skychart
The program configuration is reset to the default values.
After the first run you can copy the files you want to keep to the new folder.
Do NOT copy cartesduciel.ini because it contain invalid file path.
You can then totally remove the folders My Documents\Cartes du Ciel or ~/cartes_du_ciel and ~/.cartesduciel.ini
For Linux the application data directory also change for /usr/share/skychart, if you install additional catalogs you must move them from /usr/share/apps/skychart.
The program documentation make a big start at the initiative of Marceau GUIHARD.
Thanks to the work of all the people who work on the wiki there is now a nearly complete documentation you can directly access from the program.
You can use the Help button or F1 key almost everywhere in the program.
An astronomical clock is now available from the View/Clock menu.
The new program cdcicon show this clock with the sidereal time on the task bar.
A right click on the icon show a menu to start directly the Calendar or Skychart.
The Windows installer give you an option to start this program automatically.
A new version of the VarObs program is now part of Skychart.
This version is modified for the new AAVSO file format and store the files in the same directory as Skychart.
And all the 92 issues fixed during 188.8.131.52 development as show in this page: http://www.ap-i.net/mantis/changelog_page.php