PortAudio: error: -9986: Internal PortAudio

Hey,
I'm new to cSound and I am using QuteCsound and going through the tutorials on the site.

Currently on ;

http://www.csounds.com/toots/Toot04.html

After running the .orc/.sco for a 2nd time I get the error:

WARNING: buffer size should be an integer multiple of ksmps in full-duplex mode
*** PortAudio: error: -9986: Internal PortAudio error
Failed to initialise real time audio output

Where I need to restart QuteCsound in order for it to run again.
I read somewhere that I should add an e 1000 at the end and stop it before it finishes the score so I can run it again but this seems unpractical and I would imagine was a bug in an older version?

Anyone have any ideas?
Thanks

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