Ring does not seem to search Gnome Contacts

Hello,

I have five unique contacts in my Gnome Contacts list but Ring does not seem to find any of them when I search within Ring (eg: "Mom"). The only address book within Gnome Contacts is Local Address Book, which is 'ticked'. All contacts are phone/SIP numbers, one includes an email address. No other additional details are on file.

• ring 20180615.1.f54593d~dfsg1-1
• gnome-contacts 3.18.1-1ubuntu3
• qtbase5-dev:amd64 5.5.1+dfsg-16ubuntu7.5
• gnome-icon-theme-symbolic 3.12.0-1
• libnotify-bin 0.7.6-2svn1
• libnotify4:amd64 0.7.6-2svn1
• libgtk-3-0:amd64 3.18.9-1ubuntu3.3
• libclutter-gtk-1.0-0:amd64 1.6.6-1
• libebook-1.2-16:amd64 3.18.5-1ubuntu1
• libebook-contacts-1.2-2:amd64 3.18.5-1ubuntu1
• gettext 0.19.7-2ubuntu3+elementary0.4.1
• Elementary OS 0.41/"Loki" (Ubuntu 16.04.1 derivative), fully updated
• Linux machine 4.13.0-43-lowlatency #48~16.04.1-Ubuntu SMP PREEMPT Thu May 17 14:17:05 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

Please advise if I should provide any further details. TIA.

(EDIT: added versions of installed dependencies)