There's a known bug for this and should be fixed in the next release.
Thanks for the quick response Toni
Excellent, that solved my task very quickly. I had to modify my Web.Config and add the property uIDefaultValueForSetChangedOnPublish="true" in section EPiServer.Configuration (applicationSettings)
<applicationSettings uIDefaultValueForSetChangedOnPublish="true" .........../>
I'm trying to set the "Update modifed date" to be checked by default and to always update the Modified date on every save, unless the checkbox is unchecked by the user.
I've found the uIDefaultValueForSetChangedOnPublish attribute and set this to true in episerver.config, which does check the "Update modified date" checkbox in EPiServer as expected. But unfortunately does not actually update the Modified date when saving and publishing (while debugging, the PageData SetChangedOnPublish property is still false). It does not update unless I uncheck, and then recheck the "Update modified date" checkbox.
Is there something else I need to do to use the uIDefaultValueForSetChangedOnPublish attribute, or another way to achieve this functionality?