ctrl+shift+arrow keyboard shortcut issue when typing function
 

While using the ctrl+shift+arrow keyboard shortcut in typing out a function
(such as vlookup or sumif) once I hit shift, the computer 'locks up' and when
I hit the arrow I get the error message that I've entered too few arguments.
Essentially, this keyboard shortcut is just not working for me anymore and
I'm not sure why. I have made sure the transition navigation keys is not
selected, and I made sure that the 'extend' option is not on (F8). Please
help if you can! I love this function and use it daily!