UCSB student chiming in - I think it depends on the department, but we were all affected by the fire in December and mudslides in January, so our winter quarter started a week late. Everyone has generally been more frazzled than usual for the past few months since the already-short quarter was truncated by a week. So if you're still waiting to hear from UCSB, don't give up hope quite yet! It's very possible that some departments are still working through applications.