I installed and activated WATS through the plugin "Add New" area and after activation, the entire admin area was left blank. I had to delete the WATS directory and files via FTP to get the admin area back.
**Edit - Any ideas what could cause this? - Edit**
I've isolated this issue to a plugin conflict between the WATS and the Gravity Forms plugins. I am running version 1.3.11 of Gravity Forms (developers license) and version 1.0.50 of the WATS plugin.
I will be posting this on the GF forums as well. Hopefully it's an easy fix for either developer. (fingers crossed)
p.s. I haven't used this WATS plugin yet, but it looks pretty full-featured. My congrats to the author:)