It sounds like the little release on the latch isnt releasing all the way.
Check the end of the linkage where it attaches to the latch, make sure that piece isnt bent in the direction that the rod travels to open the latch. Sometimes this happens when someone has tried to force the handle to open the door. If it is bent in this direction, it will shorten the length of travel needed to pull open the latch.
Ive seen this happen a lot on newer vehicles that couldnt be opened from inside.
Last edited by JeffL; 03/30/2013 6:35 PM.