SOLVED!
With firewall off and pf disabled I spotted a process intended to keep
an audit trail of Internet access. I uninstalled it and hey presto.
Thanks for your help, everyone! Glad to see my macbook is not haunted.
Regards,
Fritz
On Wed, Jul 22, 2015 at 9:23 AM, Chris Mair <chris(at)1006(dot)org> wrote:
> The plot thickens...
>
> Here, on OS X 10.10.4 it works every time and every line entered shows
> up in terminal 1 instantly (as it should).
>
> If you ping 127.0.0.1 for some time you do have 0% loss, right?
>
> At this point I'd try to look at the OS X logs. Firewall is off right?
> Try to stop other software (any virtualization software, obscure network
> tools?)...
>