Cheers! I am amazed by this thing - it is simply incredible what it can do!
I had to render that garden one twice - the first time it seemed to put a second group of photos at a strange angle to the first, as if half the garden was underground?
I tried renaming the photos so that they would be organised with similar / overlapping photos grouped together, thinking that it might give the synther an easier time. Happy to say it worked a treat, increasing the Synthy value from 89% to 99% and getting rid of most of the stray points :o)