[Ken Case]

Hmm. I haven't heard of anyone losing contexts from doing a clipping; the code which processes clippings only knows how to add items, not remove them.

The only way I know of to delete all of your contexts with one keystroke is to have them all selected (either in the sidebar or in the main outline when it's grouped by context) and to then press the Delete key or to use the keyboard shortcut for Cut (Command-X). Is your Clippings keyboard shortcut near the Delete key, or at all similar to Command-X?

If you solve this mystery, please let us know!