Well. I guess I'd have no luck finding out the answer myself. I noticed two websites reported no show of Google Maps after installing the plugin, and the problem probably came from AJAX listener conflict of the theme used.
I'm using theme Atahulpa 3.7.9 which is a really good one, but also conflicts many plugins b/c I don't know how to fix them, mostly .js file links I guess.
Can anybody point out what the conflict is here with SLP? Thank you!