Problem 1:
Create a new presentation with a layout "Title, Text".
Add two entries to the Textbox, each with a (default) bullet.
Select the two lines
From the menu bar choose Format/Bullets and Numbering
Select tab "Position"
Enter 2 cm in "Width of numbering"
Press Enter
Result: Nothing happens, although the "OK" Button is marked active
(Clicking on OK is fine)

Problem 2:
same procedure as above, except
after entering the "width of numbering" switch to the "Customize"-Tab
Set "relative size" to 150%
Click OK
Result: Relative size is adjusted, width of numbering is neither interpreted nor
saved.

Tested on Win Vista 32bit, Debian Lenny
Reproducible on DEV300M59 (WinXP)