Thanks, I've updated with no issues.
> FWIW, I ended up using Emacs with nxml-mode as my docbook editor.
Update to my own post ... Tried TextMate and was impressed enough to buy a license. 2 post-install tasks I made you may consider:
1. Install the TeXMLMate plugin. Can validate using RNG.
2. Change the XML tidy utility. By default it uses xmllint, the output of which I didn't care for. I switched to using tidy (from fink). Use the Bundle Editor to change the Tidy command for the XML bundle to:
tidy -xml -indent -wrap 78 -quiet