I just installed Office 2007Ultimate. Was working on regression analysis and
the first time I tried generating regression analysis I got weird problems
with the autogenerated charts. I can duplicate with the following actions:

1. open excel/new worksheet.
2. enter 1-10 in column A, rows 1-10
3. enter a formula like =a1*2 in cell b1 and drag to b10
4 Data/Data Analysis/Regression
  Y range = $A$1:$A$10
  X range = $B$1:$B$10
  -new worksheet ply (selected by default on mine)
  -check every checkbox for residuals and probability
  click <OK>
5. move a chart on the new worksheet ply (drag the normal probability chart
down)

On my installation, every time I do this, the text "stays" where the chart
was, while the box and the bar graph move to where I drag the chart. but the
"text" that stayed is not selectable, and the chart redrawing becomes
sporadic and unpredictable, and the text appears on the newly moved chart if
I click on where it should be. sometimes. Basically the whole screen
redrawing feature falls apart until I save and reopen the file. Then the
chart behaves normally.