I don’t see any “on-screen notification” when CAPS LOCK is on or off on my system,. so, that part could be related to the type of Keyboard (hardware) you8;re using but makes me consider if this keyboard, can also have “Custom” Shot-cuts’ which can override a game’s or programs.
I’m also using Win 7 Pro 64 bit
I’ve never heard of this issue where you have no ability (using caps lock) to Lock / unlock the hotspot,. As Evil producer mentions, this is a DEFAULT setting in Carrara,.. and unless you’ve overwritten that by adding a CUSTOM key or short-cut,. then I can’t see why this would happen.
If a system reboot doesn’t fix it, and you’ve not added a customised Short-cut,.
Then your only solution is to reset your preferences file
Hope some of that’s helpful.