Hi, after a problem with a sync of 800GB with dropbox, we start from scratch.
I have removed the boxifier content in dropbox, Uninstalled boxifier, when a try to link a folder with Boxifier this seems to remember the folder name.
In my case, I have renamed the subfolders in Dropbox Boxifier folder and then remove from boxifier and add with the new name.
This has been my workaround.