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This may be related to the inconsistent simplification of simple

expressions involving %i:

Mathematically, %i^(1/4) = (-%i)^(-1/4), but the first

simplifies to (-1)^(1/8) and the second to (-%i)^(1/4) .

Mathematically, (-1)^(-1/4) = %i^(-1/2) = (-%i)^(1/2), but

the first two simplify to 1/(-1)^(1/4), while the third simplifies

to sqrt(-%i).

There are other similar cases. This is also reminiscent of the

the non-normalization of 1/sqrt(2) -- bug # 721575.