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I have a match with 42cM across 3 segments. She has the same uncommon surname as my mother. She has been correctly identified by Ancestry as having common ancestors with me (our 2 x great grandparents). She is definitely my 3rd cousin on my mother's side. Our trees on Ancestry overlap. Our four shared matches have all been identified correctly by Ancestry as being maternal.  But Ancestry designates her as  "unassigned". How does the algorithm work that one out?

I have a similar match (DN) where our common ancestor is correctly identified by Anc but sideview technology has not assigned the match to either parent. Interestingly another match (CS) who has the same common ancestor has been correctly assigned. All three of us are on MH and the chromosome browser shows my match with CS as triangulated over three segments but only one with DN. Think that suggests the lack of assignment for DN is because the sideview technology does not consider the match sufficient to assign to a parent with sufficient confidence. It does highlight that sideview technology does not use trees in making the assignment - only DNA is used. I am guessing your situation is similar?

When was this, I think they have just added several new features to it?

I just logged into USA site this morning but cannot see any new features listed in the ProTools subscription page. Have you subscribed?

Good point, TreeDigger, about IBS. Is that feasible at 21cM longest segment?
As regards Anc booboo - yes I have checked my shared match list with the mother (AC) and no, CD does not show up.

I have looked into it further since my OP and AC's brother's daughter is also on Anc. Again a first cousin twice removed (sharing a common pair of grandparents with FC) and CD is not on my shared match list with her.

I am inclining towards the double line of descent.

I have a new match on Anc (CD) at 32cm x 2 segments longest 21cM. Looking at our shared matches I can see my 1st cousin twice removed (FC) who I match at 139cM x 8 segments. Her mother (1st cousin once removed) who I match at 386cm x 16 segments is not on my shared match list with CD. Is a connection between FC and CD via her paternal line the only explanation for this or are there other possibilities?

Many Thanks, AnotherDay, for the clarification. As I live in UK I now realise why I have never heard of it. I have a world-wide subscription. I will be pretty miffed if I have to shell out more for so-called ProTools.