When you use the offset tool, it turns orange when it has remember the keys you've offset. When making subsequent offsets, it removes the keys it added at the start/end and creates new keys. If you deselect (eg spacebar
or escape
) or turn off key offset or select a different key that wasn't offset, it forgets and offsetting again will leave the start/end keys. Offset should not prevent you from selecting other keys.
Another aspect of what you are seeing is this Drag to edit
setting:
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When enabled, dragging in empty space in the graph will move the selected keys/handles. If you have selected keys and offset enabled, you can offset by dragging in empty space. If you wanted to box select instead, you can deselect.
You can disable the setting, but the idea is that it's easier to drag anywhere to make adjustments. With it disabled you'll need to drag the keys and handles. Spending hours doing fine mouse movements like that can be fatiguing.
In 4.0.47-beta we've changed the Bezier button so the default curve is computer like auto Bezier. Hopefully this means less fix ups are needed after changing to Bezier.