Why is a new tab opening everytime I click on anything in Qbase?

It might be a browser issue.  Or somebody in your office is playing a prank on you.

You can change the setting for the mouse so the different click buttons perform a different task.

For example, if you have a scroll button on your mouse, if you click that button it will open the link in a new tab.  
So if somebody got a hold of your settings, they might be having some fun.

Just an idea, (or a future prank you can play on your co-workers)