Uninstalled WindowFX and withdrew my support ticket. I feel tricked into beta testing software.
"Have you contacted support" is the automated answer to every post here, it seems. But this is not a petition, which a certain amount of people has to subscribe to.
I recommend not looking into people's systems, but into the code of the software.
Tons of people on Win 7 x64 have the issue.
Only the software developers cannot reproduce it. Go figure.