I had some more messing about with PortAudio and Lightworks. This time I decided to build my own PortAudio as using a random build it silly.
Its easy after all: Download from:
Then if you build with:
then you can either make install as root (then check where it puts them might be the wrong place) or get the libraries out of the folders and dump them into /usr/lib/lightworks
libportaudioccp is in bindings/cpp/lib/.libs/
libportaudio is in lib/.libs/
Make sure you copy the sym links over too. It should then work without problems.