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@frisi mentioned in #4 to show possibly involved changes when editing an image with cropped scales. it turns out, that those changes arent visible at all because of portal_transforms caching. the same issue here: https://dev.plone.org/ticket/13536
related topic ... pretty old though, wondered that this is still around: http://david.wglick.org/2009/image-captions-and-the-portaltransforms-cache/
Two more possible solutions:
@jpgimenez @cleberjsantos this could be related with the problems we are having on the project