That's a very good theory, can you help me test it?
Grab __init__.py from http://ftp.foosoft.net/releases/yomichan and put it in your Yomichan yomi_base/japanese directory, overriding the file that's there and let me know if that fixes it.
Grab __init__.py from http://ftp.foosoft.net/releases/yomichan and put it in your Yomichan yomi_base/japanese directory, overriding the file that's there and let me know if that fixes it.
