[galaxy-dev] Error with Heatmap : need bx-python while it's installed

Hi all, I have a problem with one of applications of galaxy-cistrome : when I run the application Heatmap, it didn't work and the log says me : "need bx-python" It's very clear. but on another pc with same installation, Heatmap run and furthermore bx-python is installed with your procedure : in galaxy-env mode with easy_install bx-python and no error message appear during this installation. Any idea of where can the problem come ? Thanks. julie