I added the DLC, and made it in to multi-player okay. Strange thing is, I can whistle, but my horse doesn't show up. I went into a few towns, and there are no longer any towns people...
If you haven't rebooted yet, I would try shutting down your PS3 and booting back up.
That, my friend, earned you a Kudo ... after installing the patch I was at a Free Roam loading screen for 4-5 minutes.
I read this thread, bailed out of RDR, rebooted ... next time back, it took only the average minute or so and I was in a session, ready to try out a coop challenge.
Stuck on loading screen
Hideouts glitch (Leveled up pretty quick with this one. As soon as I stepped into a hideout area, no enemies spawned and my xp points would come up automatically)
Horse not responding to whistle
What a glitchfest......ha!
...........What hideouts are glitched?