With the recent PS3 network outage, I decided to pop in New Vegas after not playing for a while. I had about 2/3 of the trophies from a previous playthrough a couple of months back. When the game started, I was prompted to download the 1.05 patch.
I started a new playthrough and quickly realized that ALL of my trophies are now gone for this game. This implies that everything I previously accomplished is now gone.

Has anyone else had this problem? My trophies better return when the PSN comes back up because I will be pissed

How about you wait until the network is fully functional again before complaining.

How about you read full posts before trolling? I was asking if anyone else had a similar problem.

Check your other games trophies. some of thoes are probably gone as well.

Trolling? The existence of this thread is trolling. You're asking if anyone else has the same problem, which you would already know to be true if you scrolled down and read every other thread.

PSN is operating on backup data right now, why would you expect things to be normal? Enjoy your free network.

That is the odd part. All other trophies are fine. This is the only game that seems to be affected.

I think it depends on what games you were playing and when you earned them, from what I have heard its a bit sporatic with some people not noticiing anything missing to people who are missing ones from they got the previous week.