In order to improve the SecondLife experience, we have just released new viewers for both Mac OS X and Windows clients. This new viewer fixes a problem introduced in 1.7 where SecondLife's initial graphics settings would be incorrect for some hardware.
While this problem affects a fairly small group of residents, we recommend updating to 1.7.2(5) as soon as possible. It is an optional update for now, but may be made mandatory in the near future.
Here are the release notes for this new version:
Second Life 1.7.2(5) Nov 16, 2005
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* New installations of the viewer now accurately detect hardware and adjust settings accordingly