This is dealing with a wrap-around on int64 occurs only on some platforms (macosx) and only on certain installs
pandas has to be aware to deal in certain looping constructs (see #3922)
np.iinfo(np.int64).max
9223372036854775807
2**63
-9223372036854775808
Comment From: cpcloud
possible that this line is the issue...maybe it was passed when installing
Comment From: wesm
Closing until we have a specific repro