The extension appears to have a bug. Whenever it triggers, it leaves behind the spinning “wait” wheel on the screen, even when the PopClip action is complete and the text is no longer selected. I’ve disabled each PopClip extension to determine which one was doing it. It’s consistently the “Select All” extension. The wheel pops up right after one clicks “select all.” Other than pushing that wheel onto the screen, where it hovers above all other windows and can only be removed by force-quitting PopClip, the extension works correctly.