I know I created a sketch and Extruded Cut to take the domed top off of this post, but why isn't it in the tree? I've seen a lot of strange stuff, but this is a new one. And before anyone asks, my computer was rebooted this morning, and I see the Rebuild symbol, but neither a regular rebuild or Ctrl+Q do anything. I'm curious to see what happens when I save this Part, close it, and re-open.
What's in the cut list folder? I've never seen a cut list folder created for an extruded cut.
Your tabs are in a different order than mine... did you re-order them?
Maybe your SWX is haunted...