I am attaching a fixed ImageSelector for 6.1 that you can try in your project.
You have to put the following code in the Global.asax file in order to register the field controls.
sender, EventArgs e)
sender, Telerik.Sitefinity.Data.ExecutedEventArgs e)
In App_Data/Sitefinity/Configuration/VirtualPathSettingsConfig.config add the like that will register virtual path for the embedded image selector templates.
Lastly, put the following css in the ImageSelectorDialog.ascx
position: inherit !important;
When this code is added to the template it is good to delete the cache of the browser.
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