I am having problems with V 2.5 gallery. In Firefox (latest version on both XP and Vista) the insert image only inserts the uploaded image. eg. the 550 pix wide images I uploaded. It is generating the mid and thumbnail sizes, to the same folder as the full size images. It inserts the full size image no matter what image size radio button is selected. The path indicator on the bottom of the write window however says mid when the mid size button is selected. The path indicator also says thumb when the thumb radio button is selected. But the full size image is inserted. The NextGen gallery will insert both the full size and thumbnail images.
Also in IE (V6 on XP and V7 on Vista) the uploader will not display the uploaded image thumbs and the "Show" button will not open up the image menu.