Hello, I use 3.1 and i have noticed the following behaviour. When you have a form with one image and you change for example the stencil then you can see the change in the form, so far so good. DHE does not see this change as a change of the form (the * does not appear) So when you now close DHE the change will not be saved. The change (*) will be notified by DHE when you click in the form.
Yes ;-) Sorry but this is a common inconvenience with many properties.
This because it's possible to change many properties in a time without save them every time in the Undo history so DHE will save all the changes in a time the first time you click on the page.