jackd & qjackctl crashing

[suemac at empire.net]

The message window in qjackctl shows:

cannot continue execution of the processing graph (Broken pipe)

as the last 100+ messages then qjackctl is either hung or just disappears.

This typically happens after a recording session is Ardour that is stopped.

On occasion, qjackctl just disappears while sitting there with nothing
connected.

Any ideas on what might be going on and how to fix it?

This is in ubuntu studio 8.04 with jack 116, not 109 that UBStudio ships
with.

Thanks,
Mac 

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