The thing that most stresses me out about publishing an update is breaking everyone's game ... and I came close to that. The last update had a tweak that could have caused a crash when loading a saved game and I know it did in one user's case. I believe it would only happen if your saved game was in the middle of combat. If you were in town or exploring, I don't think you'd get it. But I patched it so the games should load properly now. Sorry. Again, very nerve wracking doing updates when people have data out there.
I also fixed the issue with the new place-markers giving away the positions of invisible creatures. So they should now disappear along with the hidden monster. If your characters are invisible, you'll still see them, however.
One last note: Steam is good about automatically updating game content, but if you ever see an update notice and your build # (down in the lower-left corner of most screens) doesn't match, check your settings for the game in Steam and make sure updates are turned on. One trick I've found to force it to update is to go to the game listing, then MANAGE, then GAME PROPERTIES. Under LOCAL FILES click on the button for VERIFY INTEGRITY OF GAME FILES... I've found that that will force the update to the latest.