I have had problems with downloading photosynths the few last days. I first noticed the problem trying to download a synth using Henri Astres Photosynth toolkit6. Then I discovered there was a newer version (7), tried that one, but still negative. The exporter has worked flawless before, and I have tried on different PC's, so I suspect the problem might be on the PhotoSynth server side.
I also tried the import function in MeshLab after reading your last post, (thanks for the tip!), and receives the following error message:
"The web service returned an error"