Okay, first I have to say I'm from Finland so my english isn't perfect.
So, when I login to my gallery, it goes well, BUT I can't see those admin functions. So I can't add photos, change languages or anything, what's wrong? ???
Do you see a logout button. If no, your login doesn't stick. Post a link to your coppermine-driven gallery. You might want to clear your local cookie and cache.