With viewer 2.6.3, LL changed the avatar shape parameters for the first time in a while, revealing a case where there was NOTHING a 2.6.3 user could do to make her appearance be correct to other viewers. It seems that viewer 2 ignores shape parameters it doesn’t understand, whereas viewer 1 discarded the shape info as corrupt or so. The patch for adding resiliance to the v1-based viewers is attached to this jira:
https://jira.secondlife.com/browse/VWR-25479