xfce 4.14, on ubuntu 18.04, installed via ppa:xubuntu-dev/staging I often lock my screen with ctl-alt-l. When I unlock it, after the password input success, I'm seeing a black screen with the cursor active, and nothing else showing on it. I must wait about 30 seconds (sometimes more, sometimes less) before having all the screen (panel, desktop, open apps) working. Going to a console (ctl-alt-1) I could realize that during the black screen time the process xfwm4 --replace --display :0.0 --sm-client-id 2e5de5933-5b37-4043-8a87-bc640a83cc82 uses about 90% of cpu time (reported by htop). This bug isn't present in the standard 4.12 version packaged in ubuntu bionic. After the black screen comes to its end, that process keeps running, using 2 - 15 % of a cpu.
I made the xfce upgrade 4.14 on another ubuntu bionic pc, I got the same behaviour. Apparently, the more times un lock/unlock the screen, the more I must wait before the black screen desappears.
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