Hi again
I managed to find a quick workaround until there is a better fix.
I made a custom HTML module with code from Google:
developers.google.com/maps/tutorials/fundamentals/adding-a-google-map
(modification on my part was only frame size and map location)
As I got this to work, all other maps reappeared.
As I'm not a programmer, I don't know what this exactly means.
I would still like to have the YT shortcodes work correctly.
Kind regards
Aegir
Added 17.2.2016:
I don't know if the problem is related to Google API or how it is processed, but by having a map made with Google directions (see above) that appears on every page , my own maps made in the YT shortcodes do too, even if the fix-map has no size.