do your backing scope is viewscope?
I am using Seam 2.3, the backing bean is in a long running conversation which I guess is comparable to the CDI ViewScope.
Idont know much about the seam. There is a bug in jsf like your description when using a viewscope backingbean and render something out of the form. could you check if your backingbean of modalpanel is re-created when you open it?
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Okay what I figured out so far is that if you add a form via ajax, the buttons in that form won't do anything the first time you click them.
So don't dynamically add forms.