Hi Sam
The problem here is that having set the default duration of still images at the start to a value under options...say at 2.00 seconds. You can add the first selection of images from the media list to the time line where, indeed, they will all have the duration set at 2.00 seconds. That works for singly added images or block added images. So far so good.
Now if you change the default duration to say, 4.00 seconds all further clips from the media list (that were already there) will still be added with the 2 second value. It will not have changed.
It seems changing the default value from it's initial setting will have no effect on the duration of images that are added later from the same media list content.
"Properties" of images in the media list will all remain with the original 2.00 duration setting.
However images added to the media list after the default duration option change will have the new setting.
Obviously the work around for this seeing as you can't "block change" the duration of a set of images, is to add the images to the media list with one default setting. Change the setting and then add the next set of images to the media list which will then arrive with the new default value. This isn't the best way to work it IMHO. It means you can't use the first set of images with the new setting unless you re-add them to the media list where they will have a diffent name as well as double up the list..
I feel what should happen is that all the images on the media list should retain the CURRENT default duration and when this is changed they are all updated en bloc. In other words "Properties" should always show the current default image duration value.
This way you can add a block from the list with say, 2.00 seconds then add the same ones again or different ones with a different value.
Nat