Now required to hit return to enter value from drop down list

Stickybeak · 2011-01-17T10:34:48+0000

something has happened to my "solution" and I dont know what it is: every drop down list and menu now requires me to hit the return key before the highlighted value is placed in the field. I dont know what I changed but all I used to have to do was scroll to the value I wanted and click on it. Help!?