I have exactly the same. On my HP Spectre PC my Opera browser shows a flickering/blinking round mouse pointer / cursor.
I tried all kind of settings in Opera, no help. I fully totally uninstalled Opera, downloaded new and installed again. No help.
And indeed the Lite Mode of google maps works fine.
Full Mode works fine in other browsers too.
The problem is that other sites, that embed google maps, have the same problem. They show the blinking cursor and load very slow, or not complete or not at all.
The only thing I can remember was when I first opened Google Calendar (or was it Google Mail) in Opera, it asked something like "do you want to follow? all links to calendar?" (or something like that). Of course like every user, you glance at the message and click yes immediately.
So this is a Opera issue I would say.
Anyone any suggestions?