Today I clicked on a directory with DP2 images in Sigma Photo Pro 5.5. I noticed it started to preview the images in the directory and it promptly crashed. It repeated this each time I tried to parse the directory.
Turns out to be the AVI files that I took with the DP2 some time back could not be read by SPP55. Move them out and it was all good again able to read the directory.

I normally would not bother with movie files with such a camera but many moons ago my curiosity of what a Foveon movie on my TV would look like, hence their presence.
Anyhoo, just move em out!