1.8RC7 Ubuntu crash during ImageIntegration

[edd]

I'm getting a
'terminate called after throwing an instance of 'pcl::EUnixSegmentationViolation' while trying to create a master bias from individual frames. Peculiarly this doesn't happen if I set the pixel rejection normalisation to 'scale and zero offset', but I think I want that to be 'no normalisation' if I'm doing a bias. The individual frames are raw Nikon NEF files.

PixInsight 1.7 fails to even start, giving the same message. I also experienced segfaults while doing batch conversion in 1.8RC7 - http://pixinsight.com/forum/index.php?topic=5545.msg38223#msg38223

Ubuntu 13.04, Fluxbox or XFCE4 as window manager (since this was suggested in an earlier thread).

[edd]

Actually turns out I had clip low turned off, and if that's turned on and set to 0 it integrates ok. It's not immediately obvious to me if I should have clip low turned on, if in principle my bias could have pixels with 0 value legitimately. I'm not familiar enough with the workings of a DSLR CMOS.

It's odd that the integration seems to succeed on OS X though, but not Ubuntu if it is set without clip low.