Open several files in the Script Editor.
Attempt to drag the vertical divider between the file pane and the text pane, drag the divider left and right various distances without releasing the mouse button.
The file pane pops in and out of view and and both panes are clipped in some situations. The file pane also sometimes disappears from the window when the mouse button is released. Restoring pane visibility seems to require a Reset Pixinsight Settings operation.
Thanks,
Mike