Thank you Marco for you fast answer.
Even if it seems that all modules and plugins were updated, I uninstalled and then reinstalled SNAP 2.0 with the S2 Toolbox and now the error about GeoCoding was gone.
However I still had some issues about the Read operator: from my tests I understood that it opens a S2 L1C image as “Native resolutions” (like when opening it via GUI) and this limits the number of tools that can be applied (“Error: Product ‘S2A_OPER_MTD_SAFL1C_PDMC_20151225T192348_R079_V20151225T100538_20151225T100538’ has raster of different sizes and can not be processed.”)
Then I tried with the Graph Builder and saw that Read operator has an option for selecting how to open the S2 L1C image. It is translated - within the xml - with the setting of the “formatName” parameter as “SENTINEL-2-MSI-10M-UTM33N”.
With this parameter set all works fine, however it is a parameter dependent on the S2 L1C scene. I suppose that if the scene is outside UTM33N, then that formatName would be no more valid.
Is that correct? Is (or will be) the formatName parameter of the Read operator documented somewhere?
Giulio