Here are some of the many users having this issue:
eriney @allikazoo Is your background and user image missing? Mine are.
karyncooks Disappointed to see my profile pic and background are still
missing in action. Twitter? Buehler? Anyone? #missingbackground
rotkapchen @robpatrob my background is still missing….I'm holding
out as a benchmark of the delivery on the promise!
Some people also had their custom icon deleted and replaced with the
colored background twitter bird.
Have a coffee or two or three while you wait.
No need to PANIC. (yet)
Get a coffee twitter background from us: