This latest update caused a major problem for me. When I restarted my computer, I couldn't get my desktop site. I had to restart 2 times before I got my desktop back. The first restart said it didn't take so I did the restart and lost my desktop but then did it again(restart) and it now says it downloaded and got my desktop stuff. Was a bit worried but everything did start working right.
I had a similar problem with my Windows 8.1 laptop the other night, but it was due to Windows updates, not F-Secure. Took two or three long restarts to get everything up and running again. The first one said that the update had failed and it was rolling back changes, then it seemed to get itself together over another couple of reboots.