Thanks Taral. We did try this workaround, setting “_optim_peek_user_binds”=false but it didn't resolve the problem. From what I've read, this is fixed in 11.2.0.2, and we're on 11.2.0.3, with the July PSU patch applied. - Maureen On Mon, Sep 24, 2012 at 12:26 PM, Taral Desai <taral.desai@xxxxxxxxx> wrote: > Hope this helps > > http://desaitaral.wordpress.com/2012/01/26/ora-03137-ttc-protocol-internal-error/ > > -- > Thanks & Regards, > Taral Desai -- //www.freelists.org/webpage/oracle-l