I have noticed something similar.
For example, if I do: julia> using PyPlot julia> figure(1) julia> plot(sin(1:10)) julia> figure(2) julia> plot(cos(1:10)) then close the first figure (by clicking the red button with my mouse) I get a spinning beach ball. I’m on OSX 10.11.1 using Anaconda python. PyPlot is at version "PyPlot"=>v"2.1.1+" and my system info is julia> versioninfo() Julia Version 0.4.1-pre+16 Commit 2cdef5d (2015-10-24 06:33 UTC) Platform Info: System: Darwin (x86_64-apple-darwin15.0.0) CPU: Intel(R) Core(TM) i7-4850HQ CPU @ 2.30GHz WORD_SIZE: 64 BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Haswell) LAPACK: libopenblas64_ LIBM: libopenlibm LLVM: libLLVM-3.3
