I'm unable to install any applications and install button does not react on anything. Opposite button "Cancel" works fine.
Very weird situation which I never had before.
This appeared to happen when I flashed the latest Stock ROM with GNG1 bootloader and to resolve this problem I have tried 4 different Custom ROMs within the last few days but no luck, problem still persist.
And yes, I have performed full wipe and ticked "Unknown Sources" in settings.
What is interesting, problem is going away for short period of time after reboot.