Cells are stuck in “In Progress…” state

Open “Extensions > Extruct AI > Menu” and click “Fetch Updates” button.

Cells are stuck in “Loading…” state

Delete affected cells and undo with CTRL+Z.

Can’t modify output text

Copy cells you want to modify and paste them with Shift+Ctrl+V (Shift+Cmd+V), also known as “Paste special > Values only”.