RESOLUTION
1. Open file ~cpanel/shiva/psoft_config/hsphere.properties2. Find the line:
PATH_SITE_STUDIO = http://[YOUR_SERVER_IP]:8080/studio/servlet/psoft.masonry.Builder
and change [YOUR_SERVER_IP] to the desired value (for example the domain name of your CP box)
3. Open each *.properties file in the directory /hsphere/shared/SiteStudio/psoft_config/
and replace [YOUR_SERVER_IP] with the desired value in each occurrence of http://[YOUR_SERVER_IP]:8080/... .
NOTE: starting from SiteStudio 1.7 version this you should skip this step.
4. Restart CP
Please back up all *.properties files before editing them.