There's a very minor CSS issue related to textareas in several places. Textareas are resizable and their size is not bounded by the size of the components they're in. Drag&Drop can quickly make them so big that other parts of the forms are no longer visible and accessible (there are usually no scrollbars).
Examples: all textareas in Organization Management (e.g. Add New Group dialog), gadget editor in Application Registry etc.
You can recover from this by refreshing the page.