I currently have the iframe size set to 190px x 190px. Is there a minimum size that google will not display the map to? Is there a maximum of maps per page that google will not show maps for?
Example here. The code is there, it just doesn't display.
Did you check the javascript console? I see errors that look like they explain the problem:
Uncaught TypeError: Object [object Object] has no method 'getElements' /index.php?option=com_mls&view=list (1):1
Uncaught TypeError: Object [object Object] has no method 'getProperty' /index.php?option=com_mls&view=list (1):1
16 Refused to display document because display forbidden by X-Frame-Options.
Looks like you are trying to put a google map inside an iframe, rather than using the embedded code they provide.
Paste HTML to embed in website
<iframe width="425" height="350" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="https://maps.google.com/maps?q=719+NORTH+CHARLES++BELLEVILLE&ie=UTF8&hq=&hnear=719+N+Charles+St,+Belleville,+St+Clair,+Illinois+62220&t=h&z=14&ll=38.521293,-89.978031&output=embed"></iframe><br /><small><a href="https://maps.google.com/maps?q=719+NORTH+CHARLES++BELLEVILLE&ie=UTF8&hq=&hnear=719+N+Charles+St,+Belleville,+St+Clair,+Illinois+62220&t=h&z=14&ll=38.521293,-89.978031&source=embed" style="color:#0000FF;text-align:left">View Larger Map</a></small>