November 19th, 2009 | Published in Google SketchUp
The Measurements box did not always responding to input on the Mac. When a user brought focus to the Measurements box on the Mac (e.g. via clicking in it or tabbing to it), the Measurements box no longer accepted input. This issue has been fixed.
Selection/inferencing was not as precise. Previously, when picking or inferring entities, it was sometimes necessary to zoom in more in 7.1 than in previous versions of SketchUp and SketchUp could feel less snappy. Selection and inferencing should be back to feeling accurate and snappy.
Intersection inferences could no longer be found in some cases. When two faces intersected, the intersection inference was not always found unless x-ray mode was turned on. Intersection inferences should now be available again in this case.
...and here are the rest of the release notes
I recommend this update for all users; you can download and install it for free right now. Just open SketchUp and watch for the "SketchUp Update Service" pop-up dialog.
Remember: the crash reports you file when something goes catastrophically wrong are the most important tool we have for figuring out what needs fixing. Keep those crash reports coming, and we'll keep fixing SketchUp!
John Bacus, SketchUp Product Manager