These are both known issues:
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For the GR small plots issue see Plot size in Juno - #3 by Christopher_Fisher and links in there - the long and short is that this is a specific issue for the combination of Juno, Plots and GR in Julia 0.7 and is fixed in 1.0. The fix is a Plots.jl fix that isn’t being backported to 0.7 though. There was an issue opened on the GR repo which has a workaround here.
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For the pyplot runtime error see Julia throws an Runtime Error when trying to use PyPlot