I am having this same problem. I am running the most current version of Premiere Pro. I just updated it today. The graphics were downloaded before and didn't work. I did the update based on the suggestion in this thread.
The graphic templates appear in my library, but when I try to drag them onto a timeline nothing happens. Some however do work, and other don't Examples of those that do not work are below. In the first section none of the call outs or circles work. But the the bouncy title does. In the second group all three with the missing titles work - none of the others.
In the third group only socal icon burst, speech bubble, underline title and visual trends works.
Any idea why this would be or how I could fix it?