I have both the Testimonial Rotator and the Simple Staff List plugins running together and it looks like there is a possible conflict.
In the Simple Staff List dashboard area I get the following error under the "Staff Bio" column for each entry:
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'testimonial_rotator_single' not found or invalid function name in [...]/wp-includes/plugin.php on line 192
This seems to be preventing me from using the 'Staff Bio' info elsewhere in the site.
I thought it was an issue with the Simple Staff List plugin until I noticed the "function 'testimonial_rotator_single'" part. When I deactivate the Testimonial Rotator plugin the warning messages no longer appears.
Would really appreciate any help fixing this issue.