My PowerCenter plugin uses SC7 Perl code to create Jive menus. When you use the Jive menus to send a command to a device, the SC7 code uses showBriefly() to make toast appear indicating that a command is being sent. The Perl code for this is:

$client->showBriefly( { 'jive' => { 'text'    => [ $message ], } },{'duration' => 1, 'block' => 1, } );

This on Controller @ 7.4 r4824, but on fab4 @4875 it produces a toast popup containing no text (SC7.4 at svn r25680).

PowerCenter info w/ Extension Downloader link:
http://www.tux.org/~peterw/slim/PowerCenter.html