Wow! For now it seems to be working. Thank you, Laura! I will leave this tread open for a couple of days more in case something changes again. For now though it really looks fine.
Brilliant! It worked! Looks like I shouldn’t have any more problems with embedding maps in the future. Thank you so, Dave.
Thank you. I will check with the plugin developer.
So, it’s definitely Wordfence. Once I disabled the program, I had zero problems with embedding the map. I then reactivated WordFence; the map is still on my blog, but anytime I try to make any changes, for example resize it, the 403 error appears again. Any ideas how can I get Wordfence to accept the embedded maps?