The setting on the Integrations tab of the affected video fields has CB Core Fields Ajax enabled for Profile View but not for Userlists View which is stopping the field rendering the thumbnail for that particular view, (When Ajax is turned off, the thumbnail renders OK)
The ability for users to add their URL while viewing their profile is important (All of the sites fields including these are edited using Ajax - don't use the normal profile edit method at all)
Is there a workaround so that the user gets the thumbnail when they update via Ajax - it's a confirmation for them that it's a good URL and will eliminate lots of emails to the admin asking why their video isn't there.
Regards