Sometimes when using the touchpad while the system is swapping, it remains in a state like being tapped with one finger. Trying to move the cursor in this state results in the contextual menu being poped-up or scrolling (having the two finger scroll activated).<br />
Normally this is solved by switching to a virtual console and then back to the console which the X server is using, usually 1 or 7.<br />
This behaviour was (is) present in other distributions like Debian, Gentoo, openSuse. On CentOS appeared relatively recently after an update.<br />
On some uncertain circumstances, the X server crashes after the console switch.
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