When I launched Chrome (37.0.2062.102) today, all my extensions were gone, although yesterday everything was fine. I did some research into this issues of course, assuming that my user data is corrupt. One "solution" was to delete "%LOCALAPPDATA%/Google/Chrome/User Data/Default" which was what I did, knowing that I synced my browser state anyway.
I use the sync feature for all my Chrome instances since it is available and it worked flawlessly over the years. However, now the "Sign in to Chrome" menu entry is simply missing. I found out that you can sign in via some kind of new profile manager, I never saw before, but then you are not prompted for your sync passphrase and neither extensions nor stored passwords are restored.
When you google for a solution to this, you'll find forum entries and posts from all years for all Chrome versions. Everything outdated and nothing on this specific issue for the most recent Chrome version. Even when you look into Chrome's official help pages, you are always told to use the "Sign in to chrome" menu entry, which obviously isn't possible anymore.
So please, can anyone tell me how I am supposed to sign in and get my broken Chrome instance syncing again?