I have been using your exported cube images when I select a panorama image on Photosynth, but when I stitch the images back up, I see the outline border of each pane? I am using the PanoramaDemo WPF sample project in the codeplex helix project (http://helixtoolkit.codeplex.com
which highlights this anomaly.
It could be the sample WPF project manifesting the error, but other cube image sets seem to work fine - I did notice that your exported images are consistently saving as the same height & widths across the image set.
Image screenshot attached.