On a fresh install of 13.04 with nothing extra installed: Brand new razor mouse moves but there is no effect when i click on some windows. Keyboard confirms that KDE is not frozen. Xev shows no output when i try and click where nothing happens. I have tried other mice all with the same issue. nothing is dmesg. This issue occurs right away and also shows up during the installer live cd process.

I have done memtest on this box as well, seems fine.

Unusual. Does the mouse work on another system? It could be a fault with the mouse not sending the clicks to the system, particularly if all windows are affected. If only some windows are affected, is there anything special / peculiar about them? (eg: only Gtk+ applications are affected).

Try reinstalling your mouse driver

The mouse driver ships with the kernel in almost all cases ...

You could try in a non-KDE environment, but it sounds more like a kernel and/or distro issue than a KDE one. Does the mouse work on a different computer, maybe ona Windows one?

google for "razer mouse click" - it's a common issue with this hardware.

Hi,
This sounds more like a hardware issue.
Possibly a broken or dirty contact in the mouse.
Have you tried another mouse?