Reference Display

Hi all, I am currently struggling with my reference display for files located on ProjectWise. The references have been fine to date but then just disappeared (on several different dgn files). 
All references appear to be linked correctly, I have checked all level displays and I have run scan references and link sets. 
For some reason my references are just not displaying anymore. 

I have noticed that the reference X- and Y-offsets have now changed to "-nan(ind)". 
Has anyone else come across this before or have any suggestions?

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