I'm running Debian Sid / Siduction Xfce 32bit Xfce 4.12.2 The xfdesktop-settings window launches frozen, one CPU will max out at 100%, and nothing in/on the window is clickable. I have to right-click for a menu, click "close", and it takes about 10 seconds for another window to pop up that says "This window might be busy and is not responding. Do you want to terminate the application?" I've tried launching it from a panel launcher, main menu, the .desktop file in usr/share/applications, terminal, and root terminal. All results are the same and no settings can be changed.
Can you run xfdesktop-settings -e from the command line? You can also try an strace and see if it pulls up anything else useful. Thanks!
No feedback was provided for a long time, so closing. Feel free to reopen with relevant information if this bug arises again.