Hey Rick,

Thanks for the prompt reply.

You guys are great!

The plot deepens.

First, it does not seem to matter if the ABC file is already in the directory or not.

It does not crash at all if we run it on raw data.

However, we are running 3dTshift on the data before 2dImReg.

We got this idea from someone on the web.

If we run 2dImReg on the time shifted data, and we use the -dprefix option, the program crashes.

If we remove the -dprefix option, and we run 2dImReg on the time shifted data, it runs fine.

So the evidence is that there is some special problem in the link between time shifted data and the -dprefix option on 2dImReg.

Lets see what you think about that!

Lee