In an Impress presentation I created different objects (circles, rectangles)   
with radial or other type of gradients for the filling of their area (context  
menu of the object/area../Tab "gradient"). I tried out different values for the  
border option (in the Tab gradient) in different types of objects. In the case 
of radial gradients  
(independent of the object shape, i.e. circle or rectangle) the value of the  
option "border" was not respected in the full screen mode of Impress while it  
was correctly shown in the normal view (menu View/Normal set). In fullscreen 
mode Impress seems to set the border value temporarily to 0%.  
(How can I attach my sample file?)