Why is gnome desktop opening kchmviewer and gnome-terminal upon every login?

Hello,
From time to time, when I update the machine and restart it in order to get to the updated boot environment, when I log on I always (or at least frequently) get a gnome-terminal (and this time also a kchmviewer with an open file dialog) launched.

Note that "title bars" or these windows are usually under the top bar (panel) of the desktop, thus I usually have to drag them with alt-click.

I don't remember to have done any mistakes.

Please, how can I get rid of this annoying thing upon the logins?

Thanks in advance,
Carlos.