Tamara Jones blogged on the loops topic three years ago in http://www.tamurajones.net/FindingAncestralLoops.xhtml . Some software that has loop detection is listed there but there may be more developed since. Tom > On May 17, 2016, at 7:09 AM, Tom Holden <ve3meo@gmail.com> wrote: > > ... you have an ancestor linked to himself also as a descendant. In RM, there is no tool to find such loops. There is in some other software. You might detect it by visual inspection of the report you succeeded in getting - there should be much repetition.