When you are using loaded Revit links sometimes they go missing. This can be due to a number of reasons. The first thing to check is to see if it is loaded into your model.
Here is a quick way of checking….(without having to run around View Templates, Visibility Graphics or Manage Links)
If you scroll down to the bottom your Project Browser, and expand out the Revit Links section. This will tell you if the links are currently loaded into the model.
If you see a Red Cross it means that the Revit links is unloaded or not found. Usually this is due to 2 reasons, the model needs to be reloaded or if you are using Worksets, the Workset it is on is closed.
Solution 1: If you right click the link you can reload the link. (If this dosen’t work go to Solution 2)
Solution 2: Select the Collaborate Ribbon and click the Worksets button and check to see if the Workset is open.
If the Red Cross dosen’t go away straight away, then a Synchronise with Central should fix that.
If you have a Blue Arrow (Link is loaded) and it still isn’t visible then it is hidden by some other way and the hunt begins!!!