Hi Pablo,
depending on the size of
your data set, randtest could take seconds or hours to finish. Unless
you receive an error message there is probably nothing to worry about.
You could let us know how many loci/samples you have, and for how long your analysis is running.
You
could also try to run the same command with a low number of repitions
(e.g. nrepet=10) which should run a lot quicker. This way you will know
if there is something wrong to report.
Best,
Nikos