rdnzl:

I have updated my iPod touch (!), and as a result, the controller does not start anymore.

I uninstalled completely, reinstalled: no luck.

The app crashes on startup, with no error message 🙁

Unfortunately, it seems like the latest build of H9 Control isn't launching correctly on iOS 5. I assume that is the version of iOS you have installed; please let us know if it's not. We are in the process of preparing a new build to submit to Apple to fix the problem. Unfortunately, it can sometimes take Apple as long as a week to approve a new release.