Further – maybe helpful - informations:
issue is the same for locally stored albums and online on my webspace
jAlbum 14.1.10 -Java 1.8, 64 bit (latest update)
Win10/64 (ver. 17003)
behaviour independent from used OS or browser (tested iOS11, Win10, Android, Linux; FF, Edge, Dolphin, AdblockBrowser, Safari)
(just FYI: Adobe Lr5 has a similar issue: broken google maps support)
I just made a quick test album using my own unrestricted API Key, and it works fine. If I steal your API Key, I get the "Oops" error. So, either you've copied it incorrectly, or it is, in fact, domain restricted.