Description: Steam Workshop machines won't show up in game or Steam won't download subscribed workshop items.
Fix 1: Steam Workshop machines are displayed under a different section to normal saved machines. To load a workshop item click the load icon and then click the small Steam icon to the right of the textbox toward to top of the menu.
Fix 2: Pressing refresh several times can cause the machines to pop up.
Fix 3: Some workshop uploads become corrupted, subscribing to a corrupted workshop item will prevent any workshop items from downloading. You should unsubscribe to all workshop items and then add them back one by one until you find the one that is corrupted.