What does "Save All" actually save?

[sunil.thaha]

Tell us how you are adding images to the widgets.
Are you using the Image Collection Method. If so you might be deleting/moving the images directory.

[Mariane]

I select the object to which I want to add an icon
In Property editor, I click "icon" then "..."
This opens a window called "Chose an image"
Click "Add"
This open a window to browse the directories
(my "images" directory is a subdirectory of my project directory)
Click to select an icon
Click "Open"
This sends me back to the window called "Chose an image", in which
the new icon now appears.
Click to select the new icon.
Click "OK"

Mariane

[sunil.thaha]

R you using Kdevelop ?