Inconsistent selection between computers

 From:  Yenmonger (OTTERMAN)
Hiya, I've been trying the MoI demo on both work and home computers. I noted that selecting objects or curves is much more difficult on my home PC, than the one at work.

Note the attachment "old rail revolve" which is just 2 simple curves.

On my work machine, simply passing the mouse over either curve is sufficient for it to be highlighted; furthermore, if I click and drag, movement is automatic.

On my home machine, I have to sweep-select the entire curve before it is highlighted; dragging is not automatic, and I have to select Move from the Transform operations to actually move anything.

Solve this problem for me, and my $200 purchase is assured.

Thanks in advance for your time and attention.