Installed the latest 64-bit W/10 update (1709) yesterday with no problems seen. Started up Speccy 1.29.714 this morning and the system hung pretty quickly after displaying the Speccy screen. The whole thing just stopped; no response and no mouse visible. Had to power-cycle the system to bring it back. I just used Speccy about a week ago, prior to the update, and it was fine. I hate to be without this very nice tool.
Updated Speccy to the latest version (1.31.732) and the problem is solved. Another reason to go for the "pro" version...