Lpnj42, I wouldn't worry about the old leaves browning, the older leaves will sometimes dry up! As long as the newest growth in the center stays green and keeps growing I would say its fine! I think your right about sunburn! I have a few little aloe ciliaris offsets potted up and I was quick to move them to a sunnier position, the leaves dried up pretty fast! They returned to a nice green colour a few weeks after moving them back out of the sun.
One thing tho! I think the pot is too big for the offset? Something much more narrow would suit the offset better! and the medium would dry out faster in a small pot.
Edit: size of pots my offsets are in, sorry the pics abit blurry
