Dear Sean,
Indeed forcing a dimensionality fixes the problem, but I was hoping to take advantage of the automatic estimation instead of using an arbitrary number of components. Incidentally, what do you think would be a good number? I have heard of people using 25 for resting state, which seems reasonable, but I wouldn't know how to motivate the choice.
Concerning the mask, yes it's a brain mask and it is well aligned. Please find attach a screenshot from MRIcron that shows the overlap of the mask and a (smoothed) functional image. Maybe my mask is a bit too stringent considering the smoothing and I could consider dilating it. Do you think that could be the source of the problem?
Thank you,
Leonardo Tozzi
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