I've encountered an odd problem when attempting to share styles for a set of placemarks in a folder. This behavior occurs when the placemarks in question start out in Temporary Places.

1. I click open a kml file saved on my PC as back-up. I save the folder to my places.

2. I change one placemark's icon.

3. I click on the folder Properties. At this point, the folder is not showing an icon button in the Properties window. I go to View | Share Styles & I select the new icon as the one for the entire folder.

4. At that point, all of the icons in the folder change to the pushpin default icon.
No new icon selection shows up in the placemarks, although the icon button on the folder properties window is the correct one.

5. I close and re-open the folder properties window. The icon button appears with the pushpin default. I reselect an icon; it changes at that point.

The same thing occured when I saved some downloaded placemarks to my places and moved them to a folder.

If I create a folder in my places, with newly created placemarks, the icons work as expected.