Thank you Pierre!

Yes, you're right...! The failed images had nonsensical TR in the header, and I think I know where it was introduced, although I'm not sure why in these particular subset.
I've used CONN to analyze them but I did set TR manually, so hopefully it did not affect the analysis.

If I'm primarily interested in QC report though, would it affect any measures reported in the summary page? Registration, motion correction, scrubbing should not be affected by wrong TR and/or temporal filtering?

Ami