As I found later, not only icons in sensors-applet disappeared, but also icons in several other applications, such as rhythmbox, synaptic, backlight brightness control. The problem has gone away with the hidden folders in my home directory, most of those were removed after reinstallation of the system.
As I found later, not only icons in sensors-applet disappeared, but also icons in several other applications, such as rhythmbox, synaptic, backlight brightness control. The problem has gone away with the hidden folders in my home directory, most of those were removed after reinstallation of the system.