I copied the Google Maps AutoComplete JS example from the demo here:
Everything works great except for rendering the infowindow and shadow. I can’t figure out why. At first I thought it was because of I manually set the max width of my map, but it still renders incorrectly when I turn off all my CSS rules.
Here is an example from my client-side code:

Here is a screenshot from the demo

Any ideas?
Thanks!
~Dan
@thoughtpunch
Had the same problem, debugging revealed the problem to be with the following CSS snippet:
Removing/constraining the rule fixed it.