Richard – I’ve had confirmation back from Alibre’s QA Director.
Box select, Ctrl+C, Ctrl+V, Ctrl+A should all work in Atom3D.
It is essential that you enter 2D sketch mode for these to work correctly.
Ctrl+A will select everything, including any drawing frame – so may not be ideal.
If these still don’t work for you, try using the ‘reset user profile’ link on the Utilities Tab of the Home Window of Atom3D, then re-start the software and try again.
If still not behaving correctly you can get more extensive assistance from either your local Alibre reseller or directly from Alibre Support
https://www.alibre.com/alibre-customer-support-ticket-entry/