Question: strange error when using expand

 

I have no idea what happens here:

restart;(a+3)^17;expand(%);

 

s=05189CFC, invalid INTPOS

Error, (in Typeset:-Tdisplay[true]) object at address is invalid
                     Typesetting:-mi("` `")
Error, unexpected result from Typesetting


I have Maple 15.

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