The background doesn't save. It defaults to cave no matter what.

The background is not supposed to save, since you can change it on the wolf's page.

This didn't used to be the case when saving custom designs. But now, when I reopen a custom design link, it reverts to the cave background no matter what the previous saved background was.

Rainbow Rose - please spell your words out while on Wolfplay. Textspeak is not allowed.

Additionally, this is in reference to wolf backgrounds in the custom maker. Since you were asking earlier how to change your avatar, you can do that by heading to Pack > Account.