Ian,
None of us know anything...that's the point.
In addition, I'm not saying not to talk about it, just to keep speculation out of it because, as you can see, wet wilt and pythium are already the presumed causes based on the speculation in here.
My suggestion to you, if you're really looking to forward this conversation and help provide solutions would be to call Scott, as a colleague, and discuss it with him and see what you or he want batted around in here on GCA...
I'm surprised you, as a superintendent, don't see the harm in a discussion about your golf courses problems without your participation...even as to what the problem is...