Yep, same problem here. I tried also to reinstall the application (F-Secure Key 4.3.117). Fskey.exe is using all available CPU and rendering the application useless. I have the very same issue happening on my personal Windows 10, as well on my work computer (Win 10 as well). And got another issue - I just tried to reinstall the application, which worked fine. However, when trying to connect the devices, I got error notification that I would not have enough disk space to perform the sync? I admit, that there's only 8 GBs+ available but this should be plenty for my user data (~2.5 MB).
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