When changing the Gallery name the Folder Title always stays NewImageGalleryPage, so when people browse images from the TinyMCE image button, they see x times NewImageGalleryPage.
Fix :
ImageGalleryPage.php
add:
function onBeforeWrite() {
parent::onBeforeWrite();
if( $this->ID )
$this->RootFolder()->Title = $this->Title;
// or $this->MenuTitle?
}