Question: stacklimit error from simplify ??

Hello All, I read some other posts on "stack limits" and they were not too helpful. In a particular case there seemed to be a bug, as stated by a Maple kernel developer, but I can't imagine that being the problem here. I have a MacBook Pro (Intel) using Maple 11.02 with 2GB of RAM. The following code displays the stacklimit eror causing a failure with the kernel connection whenever I try to simplify the last line. Does anyone have any ideas? Thanks much, Steve. P.S. Here is the worksheet lines: restart one := 1/((x*Dd-x^2*Dcj)*sqrt(x^2-1)) two := int(one,x) assuming x>1, Dd>0, Dcj>0, Dcj>Dd three := simplify(%) four := subs({x = sqrt(1+Zeta^2)}, three) five := simplify(four) assuming zeta>=0
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