I have never seen an answer to the "Colonize" issue. "Colonize All" works. How do you colonize a single world? "Colonize" simply results in a "no planet selected" message.
In the release builds only 'All' is a valid argument for the colonize command. In the debug builds (SD in-house) a number of commands work differently than in the release builds, some commands don't even work at-all in the release builds.
During a dev stream in the launch week, Brad ask Paul to issue the "info" console command to check something when that command did only show a line "Printing" he said something along the lines of "Ah this is a release build, on my build it dumps all the info."
