I recently worked through the process to resolved the: Unexpected Error! [Exception during processing of ‘unknown’.] issue, where I had to decrypt my files, clear cache, uninstall/reinstall. After a couple of reboots, I now no longer have the error message. However, when I add a folder to the “Secure Folder” tab, nothing happens. I’ve been a user for about 3 years and have never had any of these issues in the past. All of these issues seemed to result after the 2.1.1636.0 build – but might be coincidence.