I haven't had this issue often and in the past turning off my alts AO fixed things. BUT ---
Today I noted during a photo shoot that Alt 1 couldn't see me sitting correctly in the furniture. Even after turning off my AO, there was still no animation showing FOR HER. To me it looked fine.
What she saw:
What I saw:
Then I logged in another alt and she could see the couch animation correctly.
I tried turn