Play with your gui sphere size , this may be whats you having trouble with.
HiTech
Moved the sphere size through the range with no change in the problem. Sometimes a closer sphere sizes there are two dots on the dialog window.
When you click ok ( on say the key map dialog) the ok lights up red but nothing happens. If you click and hold the ok button it blinks red?
This is only on the dialogs. The clipboard works fine.
This is with rift cv1 and a pascal Titan X with the latest drivers.
Terry
This has been a problem since VR day one.