I'm sorry, I haven't encountered that problem myself, although having just patched up to the latest, I'll make a point of checking Riverview next time I boot the sims. Have you patched fully? Have you tried creating a new Riverview game?
I'm not sure if you're supposed to decrapify .world files, I suspect not.
I had to take my computer to the shop a few weeks ago and wasn't able to back up any of my files and just gotten around to installing the game, so everything is a freash install. I should be fully patched to HELS since I just bought it today but I may have ran into that "Launcher lying about patches" thing, I'll have to look for that thread and double check. Should of mentioned that I'm running with WA and HELS.
I saved a few of the sims I wanted to play from Riverview and opened a new Sunset Valley, placed said sims and when into Edit sim, fixed the names but it seem to have only worked with the name that pops up while hovering over the sim itself, the world/riverview crap still shows up on the sim panels.