(And a very nice summary be Xena)

Popup blockers: You need to allow popups for ancientworlds.net in order to get the comm panel, but then you also need to allow popups for 38.144.92.98 in order to get grams.

Persona names: Don't use special characters in the name of your persona. That means no umlauts, no tildes, no accents, no Greek or Cyrillic or other alphabet letters. They cause major problems. Just the standard Roman 26.

Avatars and image galleries: Always keep at least one image in your image gallery. Deleting the last image will remove it from the gallery, but it won't free up the space. (Some people keep a one bit image so they don't accidentally empty their gallery.) Also always add a new avatar before attempting to delete an old one. Otherwise, you won't be able to get rid of the old image.