So SC4 on the App Store has been updated to a new version, which promises "bug fixes." I have no idea what the fixes in question are, but if are going to update (or if you have automatic updates turned on), BACK UP YOUR PLUGINS FIRST. Sorry for the all caps, but I am staring at an empty plugin folder. Thankfully I backed them all up yesterday so I think I should be fine, but this is going to be a really unpleasant surprise for some people.