displaying & setting location does not work

Hello,

I'm only using long/lat location information. After upgrading my test site from 4.7.5 to 5.1, I have the following problems with locations:
- the location of the nodes is not getting shown in gmaps
- when editing nodes, the location is not correctly shown in the fields (the default 0 20 position is shown), however, the correct values are still in the database
- while clicking on the gmap to set the position does not have any effect, the center(?) of the gmap is entered as the position in the lon/lat fields. Upon saving, those values are stored in the database, but the node still does not appear on maps, and upon editing the default values are shown again.

To me this indicates that location module is able to save the positions into the database, but not to read them from there. And maybe some problems in connection with the gmap module (the difficulties in setting the position by clicking on the map).

Cheers,
Ben.