The overview page open in WD dashboard 4.0.2 is eating ~7% of my CPU usage, which explains the massive rise in the temperature. I think it may have to do with the UI animation. Opening other pages such as Tools, My Devices, etc. are not causing the same issue.
I do not see this myself, but you can try enabling GPU hardware acceleration. In version 4.0 GPU hardware acceleration was disabled.
You can enable by adding the command line flag -enable-gpu-support when launching the application (e.g. edit the shortcut on your desktop to add that flag).
Yes, the same at my pc. It takes 100% CPU at 2 cores.
I already set message to support. There would be good you send it too to have bigger chance to solve it. This version is very buggy. There are already 4 threads here with new version bugs.