4 and 5 are more feature suggestions, but anyway, here are some bugs I found

1. I cant create collections on firefox, IE and Chrome work for me
2. At a userprofile: My mods is at a position relative to the stats, so there is space for "My Collections" even if it is not displayed. Also it might be possible to have so many collections, that they overlap My Mods.
3. Empty Collections are not shown.
4. You can't delete collection.
5. You can't remove mods from collection.
6. facebook, twitter and youtube icons are still not displayed on firefox.
7. In my change icons list is the non existent icon s 3 times, I can't change my icon to that and it is probably a result of me messing around with seticon earlyer.