So i enabled a shortcut to enable/disable os - ctrl + o, and with this, i can't type big O latter with usual combination shift + o, just nothing happens. When i disable shortcut in hwinfo, it starts to work again.
Sorry, I misunderstood the initial post.
I have set the same hot key as you, but can't reproduce the problem - Shift-O works normal.
Are you using the latest version of HWiNFO? Which locale are you using? Are both (left and right) Shift combinations not working?