I am using the FAQ block (out of the box - no custom templates or overrides/extensions). In the content are (the WYSIWG spot), when you add an image in the first time you can choose the image and set the margin/padding, etc, but once you save, each time you go back to the block, the image does NOT show in the WYSIWYG editor. Because of this, there is no way to update the image or its attributes without going in to the SOURCE code and manually editing what is there.
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I have verified this bug still exists in the current version of concrete5.