I’m copying the reply here as well.
For item 1 – If if you send me a link, I’ll advise on what CSS lines you modified.
You can always download the latest theme version and update your version. Your changes in the code will be restored to default, if you made them in the theme files and not a child theme.
For item 2 – The zoom level control is done in edit property page. I’m not sure what version you have not. Maybe you need to upgrade to have this option (it looks like this – http://help.wpestatetheme.org/assets/images/mapsettings.png)
For item 3 – I will need to see a live link for this (you can email me at [email protected]). It would be great if you can send me wp-admin as well. Maybe the image is the problem (it’s corrupted or not uploaded properly by WordPress). I can advise if I see the link live.