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Well. You can open the package in SimPe, go to the CRES, select the thumbnail from the drop down and delete the line (array) in the box if there's anything there. That will "reset" the thumbnail and you can ctrl+right click it in game to get to show up. (Which will be a permanent fix if it can be done.)
Also sorry if this is kind of confusing - I can't open
SimPE right now and I can't remember exactly what the thumbnail line in the CRES is called. But it would be in the drop down.