Question: Maple 12 won't plot.

I recently installed the Student Version of Maple 12 on my Intel Mac OSX 10.5.3 and started to work through the Getting Started Guide. All went well until Section 1.7 Step 7: To plot the expression: 7. Right-click the expression and select Plots → 2-D Plot. On selecting Plots → 2-D Plot, only the arrow was displayed but no plot 2x - 9 → I tried many other methods to obtain plots without success. Using Plot Builder, Preview always produced a plot but Plot always only produced the →. Please advise what I might be doing wrong. Regards, Roger
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