XFCE: Screens sometimes display hours-old graphics
Slackware 14.2, xfce 4.12. I've got two physical screens, and four workspaces. As I work through the day, I'll get a very specific graphical glitch - sometimes the wrong workspace will display spontaneously. If I switch out of the buggy one, into a working one, and back, the workspace will work again (for a while - minutes usually, before it appears again). Also, if I move the mouse, or type, the glitchy part will be replaced with the correct one, as if refreshing that location on the monitor causes XFCE to realize that it's displaying the wrong thing.
This gets progressively worse over the course of a day. When I power off, power on the machine, the buggy workspace is fixed.
Today, I noticed that the erroneous workspace displayed is several hours old (the clock icon is wrong). It's also consistent - it's not a current alternative workspace that is being switched to, but a specific one from some snapshot in the past.
Anyone have suggestions for debugging? Or even a command that would somehow refresh XFCE without me having to relog and close windows?
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