Latest version in portage is 2.0.11.
Bumped locally and it works. A small enhancement to the ebuild would be to add a USE flag to depend on dev-python/utidylib, which pytextile can use to validate it's output.
+ 03 Apr 2009; Patrick Lauer <patrick@gentoo.org> +pytextile-2.1.3.ebuild: + Bump to 2.1.3, fixes #264567 Just a simple version bump for now.