@Laryllan ok, so you did not change some DE configuration to use the traybar support instead of appindicator support.
BTW, I have quickly installed trusty + psensor and can confirm the bad scaling of the icon. Note that it cannot be reproduced with Saucy.
Unfortunely, I have no idea of what is causing this bug, all icons for ubuntu themes are provided as SVG so scaling of the icon is provided by Unity.
@Laryllan ok, so you did not change some DE configuration to use the traybar support instead of appindicator support.
BTW, I have quickly installed trusty + psensor and can confirm the bad scaling of the icon. Note that it cannot be reproduced with Saucy.
Unfortunely, I have no idea of what is causing this bug, all icons for ubuntu themes are provided as SVG so scaling of the icon is provided by Unity.