屏幕截图中显示了不可见的鼠标

I'm running 12.10 server with xubuntu-desktop installed and notice that my mouse pointer dissapears. Sometimes it's just momentary, other times I can't get it back and must resort to REISUB and shut down the computer.

I notice that from time to time I must enter xfwm4 --replace to fix xubuntu. Perhaps because I'm on older (ok, old) hardware?

这些是错误吗?

有趣的是,鼠标在下面可见!但是,当xubuntu延迟屏幕截图应用获取该屏幕截图时,鼠标是不可见的。 (与按键盘上的屏幕截图按钮不同。)

但是,在这里您可以看到消失的鼠标:

真是奇怪!我仔细检查了鼠标是否不可见。但它在屏幕截图中显示。为什么?