runaway odproxyd on Lion server on Xserve?

Perhaps someone on this list can help me...

I've got an Xserve (8GB of RAM, 3TB of hardware RAIDed disk) that I've
upgraded to the latest Lion server.  It locks up every couple of days;
the console won't respond, and I can't ssh into it.  The only way to get
it back is to power-cycle it.  Previously it was working fine (on
Leopard).

The culprit seems to be a runaway odproxyd service that's eating up all
the usable memory.  The console is showing a panel that says it can't
start a new process because there's not enough memory.  The system log
shows zillions of messages from odproxyd about not being able to do
something because there are too many open files.

Anyone have a clue about what causes this, and how I can fix it?

Bill