Thanks for this warning, Ray.
I had just clicked the button to update Photoshop Lightroom, DW and Acrobat, when I remembered previous upgrade problems, so I thought I'd better check with WA.
Glad I did - was able to stop the DW download and am happy to wait until it's all cleared.
Unfortunately, DW upgrades are now largely irrelevant, as they do little for the mysql user!
Cheers
Chris