ISSN 1527-5256 Non-displaceable contact embeddings and infinitely many leaf-wise intersections Peter Albers and Mark McLean p.271-284 Differentiable stacks and gerbes Kai Behrend and Ping Xu p.285-341 Toric geometry of convex quadrilaterals Eveline Legendre p.343-385 Polynomial Poisson structures on affine solvmanifolds Alberto Medina and Mohamed Boucetta p.387-401 On cohomological decomposition..