Unpacking the mystery around the Austrian artist’s painting, which sold for €30 million in Vienna, plus a look at a retrospective of Horn’s pioneering practice and a newly conserved Cézanne

Multi-disciplinary practitioner was inspired by the 1968 Paris demonstrations to organise artist and student group protests during Indira Gandhi's Emergency rule of 1975-77

Challenges include financial problems and a major planned renovation

Activist was demonstrating in support of workers' rights in the face of cost-cutting at the museum

Enwezor inspired a global, inclusive view of art history

Exhibition on Ghanian artist is due to tour to Mathaf: Arab Museum of Modern Art in Doha in the autumn

Commission is to support curators until successor to Okwui Enwezor is found

Former artistic director says being blamed for museum’s financial woes was among “most shocking” moments of his career

“Management errors of the past” are responsible for troubles, statement says