[Zope] url growth

Zope internally constructs URLs which can get very long and very redundant. I have one example in the logs now -- /A/B/C/C/C/C/C/C/C/D/ where the C's are completely redundant. How does this happen and what, if anything, can be done to minimize the problem? (I know this has been discussed on the list before, but a quick google didn't turn up anything...)