Hi,
Usually this error happens when the wire grid does not match the component's 
pins.
See if the pins are on the selected grid or out of it. Then, trace the wire 
again.

Regards,
Pedro.

> So, it seems I am sometimes placing components, in a way that does not
> connect them, and not 'black square' is created at the interconnect.
> 
> What do I do to force the connection?
>

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