Hi,
I am having the same problem too. When I try to add photos to my pages, the pop out box “Add Google+ image or gallery” will show an error message “Response code is 404”.
Even after
1) updating all the plugins,
2) updating the wordpress to its latest software version,
3) deleting cookies,
4) Restarting chrome again,
the error message still pops out.
Does anyone have a solution to this? Thanks.
Cheers,
Adriennehoxy