There is another language error. I have a russian Joomla and when I install RSGallery it automatically tries to recognize the language of a joomla. And it is not Russian what it chooses but some Gibberish language with characters that I could'nt read and change. I had to switch to english to able to see properly the RSgallery menu.
Overall, this component is promising, but needs to fix the above problem with IE.