I have a 920 with Portico, but if you read the app reviews with the lower ratings, it appears that other phones have the same problem. The problem is that the camera view finder screen shows only solid green, the phone gets very hot around the LED (which is off)(at least on the 920), and the app frame jitters around (shakes). Resetting the phone makes these symptoms go away, put only until the next time I try to use the app. I have only experienced these problems when using the Lens. If I open the app from the app list, it seems OK. When using the Lens, it seems to fail mostly on large panoramas (20 photos or more). With the panoramas I tried to make and opened from the Lens, it locked up around 50% of the time. I have around 10 Lenses, but this is the only one that malfunctions. My last phone was a Focus i917 with wp7.5, and Photosynth would crash around 10% of the time, usually with larger numbers of photos. The stitching is also of a very low quality on the WP7 and 8 version of Photosynth. It grossly misaligns photos even when there is no parallax error. Stitching is excellent on Windows Live Gallery, so they must have code somewhere that works. Because they never got Photosynth stable on wp7.5, and because it took them so long to get it somewhat working on wp8, I doubt if they will fix this before I choose my next phone.
March 20, 2013
V1.6 came out today, but it did not fix the problem. I used it twice, I got the green screen twice.