Xorg clipboard buffer unavailable to Broadcast field

Highlighting text in one program in X windows, and using middle click to paste this text elsewhere, I refer to as the Xorg clipboard. I haven't been able to find reference or documentation for this feature, but it seems to exist in all X windows systems except Open Office and the Indicator Applet 'Broadcast field' used to create tweets, dents and status updates.

Also, right-clicking to paste provides no right-click context menu.

Replicate problem:

Step 1.) highlight this text in Firefox
Step 2.) click on Indicator Applet icon in panel
Step 3.) middle click in the text field (no Xorg buffer)
Step 4.) right click in the text field (no right-click context menu for text input)