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You have to start the javafx application before you start the other threads and coroutines

Thanks, I will try that :slightly_smiling_face:

It is still not working, but I have narrowed it down a bit:

While a TornadoFX app is running, all blocks that are called with `withContext(<http://Dispatchers.IO|Dispatchers.IO>) { ... }` are blocking until the GUI window is closed. So the GUI is blocking the IO dispatcher?

I am not yet a coroutines pro, so maybe I am missing something here ^^