November 2019 - last edited December 2020
If you are on a Mac, please use this thread: 'Game Data Incomplete' and Grey Llama Thumbnails Replace Lots
Steps there are a bit different as the repair on Mac currently only repairs the base game.
Symptoms of this issue
This seems to be a rather common issue and seems to affect cc and not cc although it does seem only to occur on games that had cc in at one point.
Suggestions how to solve this
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