@sgunhouse Thank you.
It seems to be intermittent. I'm not sure what triggers the fault. A site's menu might work fine the first few pages then suddenly the secondary nav tabs become non clickable.
I work with a lot of websites where I have to test each one's UX so I get to see this fault frequently.
This might be a related issue. Some sites lose keyboard page scroll functionality midway through a session. Again, it is an intermittent bug. The up and down arrow keys will work great for a couple of pages within a site then suddenly cease to function in their up/down scroll capacity. Scroll bar functionality continues to work. Mouse wheel continues to work. Keyboard up/down arrow keys cease to function. Keyboard otherwise works fine.