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I can repoduce the problem. However, it seems it is not (as I thought initially) in the Giac/Sage interface, since the following workaround works:

sage: Ex=(1-2*x^(1/3))^(3/4)/x
sage: from giacpy_sage import *
sage: Ig=libgiac.integrate(Ex,x).sage();Ig
4*(-2*x^(1/3) + 1)^(3/4) + 6*arctan((-2*x^(1/3) + 1)^(1/4)) - 3*log((-2*x^(1/3) + 1)^(1/4) + 1) + 3*log(abs((-2*x^(1/3) + 1)^(1/4) - 1))

The presence of the timing information given by Giac in the expression to convert is highly unwelcome...

This is now Trac#28913.

I can repoduce the problem. However, it seems it is not (as I thought initially) in the Giac/Sage interface, since the following workaround works:

sage: Ex=(1-2*x^(1/3))^(3/4)/x
sage: from giacpy_sage import *
sage: Ig=libgiac.integrate(Ex,x).sage();Ig
4*(-2*x^(1/3) + 1)^(3/4) + 6*arctan((-2*x^(1/3) + 1)^(1/4)) - 3*log((-2*x^(1/3) + 1)^(1/4) + 1) + 3*log(abs((-2*x^(1/3) + 1)^(1/4) - 1))

The presence of the timing information given by Giac in the expression to convert is highly unwelcome...

This is now Trac#28913.