Stephan,
I've solved the problem - it was my error!
I had the reverb size at 100 and Room at 12%, This was causing the reverb to feedback on itself, but taking about 5 mins to build.
This is all due to my ignorance of the technology and I feel I owe you a big apology for causing any worry.
I am however still experiencing a problem with using the plug-in as an insert. Apart from once when it worked ok, I am getting no sound and I can't see anything obvious I'm doing wrong. This works ok in Logic 8.
