Hi all.
Nexus 5 running 6.0.1
Stock Contacts and Google Messenger apps but Contacts come from (a) My office Exchange server (using NINE app) and (b) others added to phone manually.

Until the latest Android update (possibly) I could be using Messenger and then tap the Exchange contact's photo and be presented with their details (from Contacts presumably) for editing.

After the latest update ( not totally sure if this was indeed the turning point), tapping the Exchange contact's photo within Messenger is rewarded with the "The contact doesn't exist" error message.

My own user profile/photo is set and does not give this error from within Messenger.

Manually added Contacts (via the phone) do not show the error when tapping their coloured circle.

If I go to the Contacts App itself and tap on their photo, all the person's details are presented with no error message.

So, it seems, the Contact does 'exist' as shown in the Contacts-App but now the Messenger-App says otherwise.

I am guessing there is now a disconnect between Exchange-added contacts and manual phone-added people.
I have not tracked updates to either the NINE or the Google Messenger apps so cannot be sure of the precise time the problem showed up.

Any clues ?
Thanks.
Neil - New Zealand