XFCE: Drag-and-drop pointer stuck on some windows

Question

In some programs like SMPlayer and Clementine when dragging the window with the mouse (for example by accidentally clicking on the program window instead of the media progress bar), the mouse pointer freezes in the dragging-hand state and does not return to the normal cursor when releasing the left mouse button. The keyboard will not take any input at this state, either.

When reacting qickly to this and pressing Control+Alt+F1, it is possible to enter the non-GUI logon screen, enter the username and password and restart lightdm with sudo service lightdm restart. Else, the system will completely freeze and must be resetted manually.

This only appears to happen in programs that use the classic NT-style windows, such as the mentioned SMPlayer and Clementine (unsure).

What could be the reason for this and is there any way to solve this problem or to release the drag?

To reproduce: Start Ubuntu Studio (/Xubuntu?), install SMPlayer and/or Clementine out of the Software Center and drag the window near the media progress bar on the bottom of the screen.

Answer 1

I've been having the same issue lately, while using Gimp and/or Netbeans.

What worked for me, was follow this procedure :

1. Switch from graphical tty to a console tty using Ctrl + Alt + F1
2. Switch back from console tty to graphical tty using Ctrl + Alt + F7

That's really all it took to "fix" the cursor.

I didn't even need to login at the console tty. Just switching between ttys did the trick for me.