Marcus - programmers are looking into it for you. For now, what we did was reset it so that it filters as you type, but you'll see more than just employees and vendors. So you'll see customers too (which is not desirable). It seems to be isolated to your account for now. Since it was a dropdown, and we just did a massive update on dropdowns, it could be related. We'll let you know tomorrow what the problem was.
Thank you for bringing it to our attention.
Paul