I have updated to Adobe Bridge 13 (Version 126.96.36.1992).
Now Batch Rename with Metadata isn't working anymore. Regardless of which Metadata-value I select, it always takes an aperture value (e.g. "f^F11,0"). So it ignores the selected Metadata-value and fills the batch-rename with "f^F11,0".
I often use "Metadata Image-ID" for Batch Rename. With this annoying bug, that is not possible at the moment. 😞