There was a Javascript error in the Dashboard in 2.1b3 that caused at least 6 bugs. I commented about it in this issue: https://github.com/vanillaforums/Garden/issues/1833
Vanilla has gained a whole slew of new plugins and functionality just in the last 6 months it is awesome . A testament to the flexibility of the framework. If it does not exist, it can be created :)
If the user wants to upload a file, and the file has an ampersand '&' in the filename, the upload will fail silently. Tested on a CentOS 6 server running Apache/PHP/MySQL, on Safari, Firefox and Chrome.