Created attachment 866056 [details]
Photo showing the problem.

When I login to XFCE, soon after boot, the XFCE session is corrupted (see
attached photo). Applications do not respond or just a bit. Can't open menu to
run other apps. I have to exit via ctrl-alt-backspace--backspace.

Workaround is to delete, from text mode, directory ~/.cache/sessions/*.

I have made a backup tar to reconstruct my session faster.

The home folder was initially cloned from another machine (for
Thunderbird/Firefox mostly).


This also happened on another machine this past summer, using 15.3, for some of
its users. Has not happened on 15.4, but it used only sporadically.

Ask for any needed information, logs, etc.