ortoiseSVN 1.6.12 has been released.
This is a bugfix release/maintenance release, linked with Subversion 1.6.15.
We recommend that you update your TortoiseSVN client to this latest version. You can get it from our download page.
Also note that if you upgrade from a version before 1.6.10, you have to run a repair install after the upgrade. To do that, run the installer again and click the "Repair" button. I'm sorry about the inconvenience.
If you want to know why the repair install is required, you can read about the technical details in my earlier post.