In my last version of Blender 2.5 I was able to rotate objects in object mode but in 2.71 I can’t do that. Setting or me? Any help will be most welcome. Thanks.
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You’ll have to describe how you’re trying to rotate things… keyboard shortcut(s), widget(s), Python script… you know what I’m talking about. 
For me (and likely most other people) it’s been far too long since I used 2.51, so I don’t remember what I had to do to adapt to the workflow I’m using now.
Check to make sure you haven’t accidentally turned on Manipulate Center Points. That little button with three dots and a two way arrow.
This was the problem … Thanks a bunch!
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