Map not saved

Hi there!
nice to see you again.

In June I installed this plugin (Google maps) and it worked fine.
than (last month) I upgrade wordpress multisite (with aout upgrade the plugin too) and it stop working.
It still working with the map, and the blog, I already created, but I cannot create more map in new blogs.

I thought it was because I didn't apgrade, but now I've upgraded to the last version of the plugin and it still dont work.
when I try to create a new map and press Save I get a "map not saved" message and I can't go on.

this plugin gave me a lot of 403 problems too
I hope it'll solve with the upgrade I've juste made, but would be great if you can confirm me this.