nadir spot crash

I am working a on a project and whenever i try to add a nadir spot, ptp 1.8 crashes.
This has happened perhaps 8 times today. It doesn't matter if all panos are selected or just one. The nadir spot I have used on many other projects. The last project I did had 350 panos and it crashed a couple of times until I deselected the non full spheres. Again it doesn't matter if it is one pano or all of them on this project
Here is a crash report if it helps... oh it won't paste...
many thanks in advance
This has happened perhaps 8 times today. It doesn't matter if all panos are selected or just one. The nadir spot I have used on many other projects. The last project I did had 350 panos and it crashed a couple of times until I deselected the non full spheres. Again it doesn't matter if it is one pano or all of them on this project
Here is a crash report if it helps... oh it won't paste...
many thanks in advance