I had some very strange problems with GraphicsGrid.
The individual PraphPlot:s looks nice and ok, but the code
GraphicsGrid[{{GraphPlot[{{a -> b, "ab"}, {a -> c,
"7"}}]}, {GraphPlot[{{a -> b, "5"}, {a -> c, "2"}}]}}]
just produces 2 big clots of garbage. If I remove the edge labels, everything works as expected. I am using Mathematica 7.0.0.
I had some very strange problems with GraphicsGrid. The individual PraphPlot:s looks nice and
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I got the same as you did, though I’d have called them small bits of rubbish. I fiddled around for a few minutes and got this:
which is a bit different but maybe of some use. Got to get back to work now.