Amazing plugin. By far the very best testimonials plugin I've tested.
I've run into a strange bug though.
After adding a 3 groups, and assigning testimonials to those groups the widgets screen shows up blank.
Restoring the database to before assigning the groups fixes the problem. So does de-activating the plugin.
Re-creating the groups causes it to show up again. Same with re-activating the plugin.
Do you know of what might be causing this, and the fix?