I played an unmodded save in Live Mode for about 30 min, then spent another 30 in Build Mode. No bugs so far. I then loaded up my modded save and put my CC back in, and so far so good, but I've spent most of my time in Build Mode. Just in case, though, I saved my modded save as a new save, so that the modded save before the patch is still intact.
If you're itching to test out the new stuff, maybe just start a new save or play around with one that isn't super important to you. I think as long as you don't enter old saves - and re-save - they should be safe.
Number of times I used "save" in this post: 9 :D
