I went out to explore, and when I got back to my home, all of the living room furniture was gone.

[Igraine McMillan]

I went out to explore, and when I got back to my home, all of the living room furniture was gone.  This is stuff I bought years ago, it is no copy and the sellers are no longer in SL.  I have tried logging out, logging in, clearing my cache.  HELP!!

[Nyll Bergbahn]

Did you check your Lost & Found folder to see if the furniture is there as a coalesced object? It's name could be any of the missing items as it takes the name of the last object included.

[Lindal Kidd]

There are basically only two ways this could happen.

1.  You (or your region manager/owner) enabled auto-return for objects rezzed by unauthorized people (you, if you weren't wearing your group tag when you placed them).  In this case, look for them in your Lost and Found folder.  They may be lumped into a "coalesced object", with the inventory symbol of a little stack of cubes.  The object may have any name, including "object".

2.  LL or the estate owner restarted the sim, and there was a glitch that lost your objects.  In this case, file a Support ticket.  If it's a private estate, contact the estate owner or manager and have them request a "rollback".