Thank you for the details.
I realized that the pipeline had changed but was not updated in the tutorial.
It is not possible to run anymore the process "Interpolate time" directly on the stat files, you need to apply the threshold explicitly first.
I pushed some modifications to the software (get them by simply updating Brainstorm): https://github.com/brainstorm-tools/brainstorm3/commit/2a7d181aee1f089b01742818ff5a9d63267638e0
And I edited the documentation:
https://neuroimage.usc.edu/brainstorm/Tutorials/Epileptogenicity#Create_a_movie_with_the_SEEG_signals
Please let us know if you find anything that does not match between the documentation and the interface of the software.
Thanks