I changed the "Picture Length" from 7 to 20 in the Program Settings>Video/Audio but when I imported a set of pictures, they were still 7 s in length on the timeline. I could get imports to work only by exiting MEP and restarting it. I think it used to work properly in older versions of MEP. Perhaps ALL other settings options should be checked to see if they have an immediate effect.
7Gb ram, AMD Athlon II 215, 1Tb main drive. Win 10