Can reproduce it with DEV300m39 on WinXP and DEV300m37 on Fedora

How to reproduce it
1 Open a new Impress document
2 Slide Show - Slide Show Settings, "Slide Show" dialog opens, then check 
  "Window" and OK
3 F5 to show slide, File - Close, give us a hint "The document ** has been 
  modified", hit OK button in the hint dialog, pay attention
4 Left_Click many times to exite "slide show", then pay attention to the area
  under the Scroll bar, then F5 again

Result
After step 3, there is no feedback to save the file to any place
After step 4, find a black bar under the Scroll bar; After press F5, Slide Show 
doesn't work well, some part of window for slide show, and some part of window 
for normal view.

Expectation
After step 3, should show a save dialog to save the file and close the file.
After step 4, keep the initial proportion; No black area under the Scroll bar;
Slide shows well at the second time.

Regards
Li Meiying