You must have come across this problem one or the other day that Ctrl + Enter that always used to fill the URL address by .com doesn’t work anymore.
I also came across this problem recently in IE browser and here is the solution to solve this problem.
1. Run Internet Explorer
2. Go to Internet Options -> Advanced tab, under the browsing section.
3. Search this option “Use inline AutoComplete” and make sure that it is checked.
4. Click Apply and OK.
Restart may be required but this would have solved the problem.