To do this without reinstalling Second Life, move all of your existing settings files to a different, temporary directory. Next time Second Life starts, it will create a new, default set of settings files. Your settings files can be found in the following location:

Vista: C:\Users\<Your Username>\AppData\Roaming\SecondLife\user_settings

Log off of Second Life
rename the settings_releasecandidate.xml file to old_settings_releasecandidate.xml
Log back on to Second Life

If this still doesn't solve your problem, try clearing out your cache files How do I clear my Second Life cache?

Please also see this article for uninstalling and reinstalling the Second Life Viewer How do I fully uninstall and reinstall Second Life?

Thank you : )

Resolving re JIRA issue posting guidelines Please reopen [left sidebar] with further comment if you still have this issue.

Attempted uninstall-reinstalling; however, when I went to delete the files out of my Temp folder, the Explorer window crashed and I couldn't do much...
I did uninstall/reinstall the viewer, though. I don't think that worked, either.

I'll comment again later, when more of my friends get on – that way I can see if the people who did the temporary fix the other day are still visible.

I don't think that this got fixed-- I commented on it last night on why.

http://secondlife.com/support/downloads.php

If this is still an issue please Submit a Ticket with Support for a response tailored to your individual situation see JIRA Home page

Thank you : )