1)Create a new Impress presentation.
2)Double click to apply a layout (eg, the "Tile, Text" layout).
3)Type some text into the title.
4)Right click the layout and choose "Insert Slide".
5)Press PgUp to go back to the previous slide, select the text in the title. You
will find that the Cut and Copy commands on the Edit menu are grayed out.
6)If you deselect the text, then select it again, you'll find the commands are
now enabled.

Note that step 4 is critical. If you choose Insert | Slide from the main window,
then there is no such problem.