FFD baffling to newbie
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What does it mean when the FFD "box" with +-sign handles appears, but all the handles are gray and do not respond to any mouse events?
I followed what I think is the right recipe: make an object into a Group, select it, right-click to get Context menu, select FFD 3x3.
I get the cloud of +-signs. But on most occasions, when I double click to activate the FFD feature, the surrounding box frame and +-signs turn gray and are not interactive.
Is there something about my object that makes it incompatible with FFD?
I'm getting one other strange FFD mode (same object) where I do get interactive handles, but all they do is resize the wireframe box. The original object is untouched. Moreover, I get messages like this:
Error: #<NoMethodError: undefined method `[]' for nil:NilClass>
Have I missed a <Return> or a moment where I should have entered numeric data?
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