What kind of media?
The file extension is .mod
A friend of mine actually fixed the problem for me. I had to right click on the file and select (I think) the option to link the media to a specific file. This took care of the issue.
Glad that the Relinking of the Media fixed things for you. Normally, one does not need to do any Relinking, as the Link should be established upon Import. Out of curiosity, are those Assets on an external, or networked HDD?
Thanks for reporting what cured things for you, and welcome to the forum.