there are two errors in the BC2 manual in the chapter of sharing... (https://secomba.atlassian.net/wiki/display/DOC/Share+access+to+a+folder?lang=de)
1. The share process
On the second screenshot you see the menu with the option for sharing in the Boxcryptor sharing option. But this option does not exist in the way showing in the manual. If you want to see this point you have to encrypt the folder first which generates problem 2
2. if you encrypt a shared folder with file encyption (I only tested it on Microsoft Skydrive yet) you will lost the share). So you have to first create a folder, encrypt it, share the "chinese" folder in the Skydrive and then share it via Boxcryptor. But with Skydrive this function is not very useful because the other user only see chinese folders. So it would be great, if you can choose for every folder if you want to use filename encryption.