No need to ask the same question twice. Also, a search of the forum would have provided the answer.
This problem with Galerie exists since Leopard (MacOSX 10.5). It happens when there are spaces in the path to the dragged files. If I remember well, the problem only exists with dragging files, not with using a selection in iPhoto.
The problem is solved in a beta version that you can download here: http://www.myriad-online.com/mac/Galerie.zip You can use that beta with the files provided with the latest release version.
(Note that development of Galerie has stopped and that possible problems with future MacOSX versions may never be solved.)