Deleting?

Hi - relatively new to this - or at least serious mapping, so I may be on here a lot with many questions.

Simple one to start with.
I cannot delete anything....

I have done many times before - but now, I click on the 'rubber pencil' icon and the mouse no longer turns to the little square to select the symbol to be deleted. When I go via the Edit>Erase - it says that CC3 cannot perform the command. What has changed?? Also - when I click on the 'Change Properties' key - to do that - it also doesn't bring up the 'little square' on my mouse that selects these things - and thus is also not working....

What have I done wrong...?

many thanks.

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