gmaps shows no lightbox

[rei-we]

Very nice themes. Isotope working wonderfully. Gmaps thrilling, but opens only a new page with the picture, even html says clearly: "a class="yag-gmaps-item-link" rel="gmaps-lightbox-54-****".
All js loaded. General.ts reacts to formadjustments.
Astonished about Themes.ts because it points to wookmark? But changing to gmaps gives no change.
I use latest yag and themepack with typo3 7.6.11
No systemreports. No comments in firefox console but
TypeError: $(...).popover is not a function
$(function(){$('[data-toggle="popover"]').popover()}); bootstr...1502.js (Zeile 6, Spalte 14)
which I consider to be irrelevant for my problem