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I'm trying to change the text and arrow style in GraphPlot using the drawing tool, but the the vertex labels disappear when I do that:

GraphPlot[{Subscript[\[Delta], 1] -> Subscript[X, 1], 
  Subscript[\[Delta], 2] -> Subscript[X, 2], 
  Subscript[\[Delta], 3] -> Subscript[X, 3], 
  Subscript[\[Delta], 4] -> Subscript[X, 4], 
  Subscript[\[Xi], 1] -> 
   Subscript[\[Xi], 2], {Subscript[\[Xi], 2] -> Subscript[\[Xi], 1], 
   "\!\(\*SubscriptBox[\(\[Phi]\), \(21\)]\)"}, {Subscript[\[Xi], 
     1] -> Subscript[X, 1], 
   "\!\(\*SubscriptBox[\(\[Gamma]\), \(11\)]\)"}, {Subscript[\[Xi], 
     1] -> Subscript[X, 2], 
   "\!\(\*SubscriptBox[\(\[Gamma]\), \(21\)]\)"}, {Subscript[\[Xi], 
     2] -> Subscript[X, 3], 
   "\!\(\*SubscriptBox[\(\[Gamma]\), \(32\)]\)"}, {Subscript[\[Xi], 
     2] -> Subscript[X, 4], 
   "\!\(\*SubscriptBox[\(\[Gamma]\), \(42\)]\)"}}, 
 VertexLabeling -> True, DirectedEdges -> True, 
 VertexCoordinateRules -> {Subscript[\[Xi], 1] -> {0, 3}, 
   Subscript[\[Xi], 2] -> {0, 0}, Subscript[X, 3] -> {Sqrt[3], 1}, 
   Subscript[X, 4] -> {Sqrt[3], -1}, Subscript[X, 2] -> {Sqrt[3], 2}, 
   Subscript[X, 1] -> {Sqrt[3], 4}, 
   Subscript[\[Delta], 1] -> {Sqrt[3] + 1, 4}, 
   Subscript[\[Delta], 2] -> {Sqrt[3] + 1, 2}, 
   Subscript[\[Delta], 3] -> {Sqrt[3] + 1, 1}, 
   Subscript[\[Delta], 4] -> {Sqrt[3] + 1, -1}}, ImageSize -> 320]

results something like

enter image description here

when I use the drawing tool to make the text and arrow head bigger, the vertex labels disappear

enter image description here

Why that happens and how to get around that? I'm using version 8 on Mac. This also happens in version 8 on Windows 7.

share|improve this question
    
On version 9 (Mac) you can change the size of the labels freely (and they're still visible), but as soon as I touch the Arrowhead sliders they disappear and don't come back. –  cormullion Apr 20 '13 at 19:47
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