This seems to be solvable my using df.sortlevel, but Wesley encouraged me to submit it for further investigation.
I wrote a pretty detailed investigation here:
http://nbviewer.ipython.org/4465051/
with the gist
https://gist.github.com/4465051
In short words:
2-level indexing for a 3-level multi-index fails for me, when the size of one of the first 2 levels is larger than 9 and not using sortlevel.
In examples:
df.ix['c1','det4'] works as long as the sizes of the multi-index are up to (9,9,x) with x anything.
But if the levels size is (10,9,x) I am forced to use sortlevel(0) to make it work. (see notebook).
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