A rolling restart of each region is now underway. This will allow the new code in Second Life 1.9.0(19) to be propagated to each simulator. This means that each region will be restarted once to put the new code into effect. When the region goes down and you are logged out of Second Life, please wait a minute or two and then log in again.
Release Notes for Second Life 1.9.0(19) Mar 30, 2006
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* Resolved an issue which caused llXorBase64String to return an error in some circumstances