Argh, sorry. I usually search for existing bugs before submitting a new one, but sometimes forget... This is indeed the issue. Thanks!

On Sat, Aug 28, 2010 at 6:15 PM, Bryan Pendleton <bpendleton.derby@gmail.com> wrote:
I hope this is the place to post such issues. I've recently renamed an
identity column, and then found that it no longer functioned as one;

That's DERBY-4693, I believe: https://issues.apache.org/jira/browse/DERBY-4693

It's fixed in the 10.6 branch, so you could build the fix for your own use.

There's also a 10.6 patch release in the works for the fall:
http://wiki.apache.org/db-derby/DerbyTenSixTwoRelease

thanks,

bryan