Hi there! B)
I have just created a new Package and added several modules to this package.
When entering “Stduio” to customize these modules, they do not appear at all.
The list on the left only shows the modeules that come with the standard installation, but not a single one of my modules.
Any idea anyone? 
What step do you do after creating all modules in module builder? do you deploy your modules? I recomend to you to publish them and then install them as any other package in module loader
Best Regards
Dear Mike,
you were right! I completely overlooked th e"deploy" button! 
Everything is fine now! 
Many thanks and best regards
Mark