Edit: After clicking assigned button on mouse to close app, it takes about 10 seconds for it to accept the command & then close.
This is unacceptable as the older Modern Mix version closes apps instantly.
I've tried uninstalling new version & reinstalling old version but the old version does not work with Windows 8.1 Pro. For example if I use old version & open Mail app, the app opens 3 times & they get stuck on screen. Old version is totally useless in new OS.
This problem happens only with apps using the Modern Mix software.
Normal programs/folders opened in desktop (e.g. web browser, photoshop, etc) closes normally so I don't think the problem is caused by Logitech software.