- Create a new empty presentation.
- Insert a custom text box
- Turn on list mode by pressing Bullets On/Off
- Press tab
- Enter some text on line 1 at list level 2
- Again, press Bullets On/Off to disable the bullet on line 1 level 2.
- Your text box should look like the following:

   some text

- Save the presentation and give it to your friend. Ask him to 
  help you getting rid of this funny indentation before your 
  "some text" text.

At this point, the text box looks like having a paragraph layout with some level
of "before text" indentation. So:

- Click on the text box for editing.
- Select Format/Paragraph from the menu.

The dialog really shows some "before text" indentation.

- Set this indentation to 0.00. Now your text box looks like the following:

some text

- You think, you are done, but:
- Select the text box.
- Assign another graphic style to your text box.

And, no matter what indentation this new graphic style declares, the "funny"
indentation from above does reestablish. While editing slides yesterday night I
nearly drove nuts...

The problem here is that there is still a "list" hidden behind the scenes, but
nothing in the UI gives you a hint about that. The only way, to really get rid
of this magic indentation is to revert your operations from the beginning:

- Select the text.
- Turn Bullets On.
- Press shift-tab.
- Turn Bullets Off.

Note: Pressing shift-tab does not work while bullets are switched off.

I don't exactly know, where's the bug, but I feel, there is one... :-)