Screen shut down on HDMI connection

Hi and thanks for maintaining this fork of a very good dock app.
I have a problem with my setup on a desktop computer when I connect the monitor with HDMI.
Namely, after screen turns off, and back on (power management), preview windows are lost, and only the label of the app pops up on mouse over. I, for now, switched to a VGA connection, but the quality of picture is much poorer than the HDMI.