I am using v1.5 of the plugin, and author boxes are showing up in sidebars as well as the article area. The fix that worked for me is to add the execution priority setting value to your call to remove_filter('the_content'). Since the add_filter('the_content') call included an execution priority, apparently you need it to match when you call remove_filter(). So, basically, I changed line 329 of ts-fab.php from this:
remove_filter( 'the_content', 'ts_fab_add_author_box' );
... to this:
remove_filter( 'the_content', 'ts_fab_add_author_box', $ts_fab_display_settings['execution_priority'] );
Please update in any future version of the plugin. Thanks!