New added images to water marks no shown in image editor

Steps

1. Copy the euflag.png (attached in this test case) file to the .run/extension/ezie/design/standard/images/watermarks directory
2. Edit the .run/extension/ezie/settings/image.ini.append.php file and add the following line on the [eZIE] group
watermarks[]=euflag.png
3. Login in Admin as Admin
4. Select Setup link on top menu
5. Click on "Clear all caches" button
6. Verify that "All caches were cleared"
7. Edit an image
8. Add a watermark
(only the defaults ones are present)