Hi @LukasSchlechter,
Your visual's update() method is called when you have supplied the necessary conditions to satisfy your dataViewMapping; the exception being unless you are using supportsEmptyDataView in conjunction with supportsLandingPage to have no data binding. In this case, the update method will fire as soon as the visual is instantiated, and thereafter for the scenarios outlined in the diagram here, as expected.
If you've ruled out the data binding potentially being incorrect, the next thing I'd look at is seeing if any errors are being suppressed by the developer visual.
An easy way to investigate is to use a try/catch block to identify the error to see if anything's being suppressed, and possibly to step through using the debugger statement in your code before any suspect lines (or even right as the update method is triggered, just to confirm it. I often also use console.debug() in code I'm trying out to ensure that the right methods are being hit, without interruptng my workflow too much.
If you're sure that the above starting points are not applicable to you, then ideally you'll need to share your code with us (preferably as a repository, so we can verify the combination of packages, capabilities and code to see if there's anything else that stands out.
Regards,
Daniel
