Hi all !
Installing a RocketLauncer package on another (brand new) VPS I encountered the "headers already sent"-error. It was the ONLY install error.
Installing another RL with a different template: same error. Finally I found the culprit, by thinking what I did different on this server then former installs on other servers (with other PHP-versions). This time I had to copy the configuration.php info to a blank file and FTP it to the server. Never had to do that before with Joomla. It seems that some versions of PHP-parsers have problems with white lines and the PHP?> (or ?>) closing statement in INCLUDE files.
So I deleted the ?> and all blank chars and lines after the last statement in the configuration.php file and BINGO ! Error gone !
Does PHP stand for: Permanent Headache Provided -or- Psychiatric Health Problem ?