Dear Alfonso

I am glad to hear from you.  I was able to do these steps and they worked for me.  Trial and error can be a beautiful thing ;-)

In fact I also re-generated the movement (realignment parameter) files for all subjects and ran my analyses with those included (as you recommended) as well. To answer why some had them and others did not - the answer is that we are performing funcitonal connectivity in the fetal brain and fetuses do not take directions like "please stay still" to heart.  We need to extract the periods of (relative) stationarity from several sessions, and mask each length of time with a set-specific hand drawn mask, then manually transform into the right orientation.  So each segment (within a scan) gets preprocessed as its own session - thus we optimize for each length of time the fetus was still.  In this pilot analysis I selected to re-concatonate scans from within a session before submitting to your analysis.  Thus for some scans there were not complete realignment params. But, as I stated above, I went ahead and I ran realignment on all data in order to generate these files that would correspond (exactly) to the frames I submitted to your analysis.  So, all is well now & that explains why I had some work arounds.  Fetal imaging is a challenge & requires a bit of additional work and creativity.