Since Iris v2.1 beta, users start Iris with

$ source activate iris
$ iris
	   

If you had installed Iris v2.0.1 or lower at some point, you may have set "iris" as an alias in your shell config file ($HOME/.bashrc, $HOME/.bash_profile, or $HOME/.cshrc) to startup Iris. Please check your shell config file and see if there's an alias called "iris." Please either remove the alias or rename the alias to something other than "iris." Then source the shell config file, for example:

$ source ~/.bashrc    # (or ~/.bash_profile or ~/.cshrc)
	   

Now when you run iris, the latest version should open.