Title says it all really. It is in no way a crucial or game breaking bug, just any mod you download via the Workshop has to be re-downloaded each time the launcher starts. To be honest, I am not really sure they are re-downloading. But if you load the launcher and immediately press play, you'll load without your Workshop mods (but with mods you installed manually). If you flip to the mod loader section of the launcher immediatly, you'll see it's only populated with manually installed mods, and the Workshop mods take a few moments (occasionally a decent amount longer, although I have never had it take more than a minute or so) to populate the screen. And if you loaded the game before this process is complete (and had to exit because a mod was required for the save you wanted to play or what not), the mods will be unchecked (aka set to not load), where as manually installed mods are always checked (aka set to load). However, if you go to the mod screen and wait for all the mods to load in, then the next time you start the game, for whatever reason, all the Workshop mods are still checked (aka set to load), so long as you give them time to load into the launcher again. I also (and why I say that the mods are re-downloaded) if you restart Steam in Offline Mode, or if you disconnect your computer from the internet connection, all your Workshop mods will be unavailable (The mod loader section of the launcher just displays the message "Steam Workshop: Getting Subscription List" for a while, then...nothing). Again, manually installed mods appear, are checked ( aka set to load), and work just fine even in these situations. Really, it's more just a very strange thing than anything else. I use the Workshop for Skyrim mods as well, and this situation does not happen there. You can play using your Workshop mods in Offline Mode or while not connected to the internet, and the mods don't need time to load before you start the game from the launcher. Anyway, hope that info is useful. Nothing to get too worked up over, obviously, but I thought it was something that should be here, since no one else has reported it yet (that I could find), and it does make saves using Steam Workshop mods unplayable while not connected to the internet.