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CMD-Installer on Os X overwrites .profile
OsX has two configuration files for bash/sh (~/.profile and ~/.bash_profile). ~/.profile is used for bash and shell. If ~/.bash_profile exists, it will be used for bash but the content of ~/.profile will be ignored!
Your installer of extjs-cmd writes its path-environments into ~/.profile. Thats ok. But it also writes into ~/.bash_profile, even if it not exists! That's not a good idea, because if a user has stored the bash- and sh-configuration in his ~/.profile, the existence of the new ~/.bash_profile will make his bash configuration to be ignored.
So please change your installation routine, that it only makes changes to ~/.bash_profile, if it already exists!
It's the same in Version 126.96.36.199, 188.8.131.52 and 184.108.40.206.
Thanks for the report! I have opened a improvement request in our bug tracker.