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I know I have.
Here's the tip:
You cannot 'Reset to 3D Extents' for a level 'while the view is being cropped'.
Just (temporarily) 'turn off' the 'cropping' of the view you THEN you can freely 'Reset to 3D Extents' for a Level with a 'right click' or by dragging the level's 2D or 3D grips.
This had frustrated me to no end in the past.
Below is a fresh CADclip demonstrating this concept.
I have since been informed that if all 3D extents of a level line lie 'within' the crop region then you CAN in fact use the 'Reset to 3D extents' tool. When you think you know everything . . . . be afraid : )