This isn’t an issue that can be discussed here because it’s a third-party plugin. You should raise the question on the plugin’s support page.
That said, the field is still working alright for me, so the error must be somewhere else. Perhaps some corrupted files after an upgrade? Try re-uploading/reinstalling and see what happens. Also, look whether the error console says anything.
Oh, and I also support the feature request for a native OSM field. 🙂
