Thanks, but no further forward.
I do drum it into the students to copy all media across to a folder within their project folder, where everything else is saved, so there shouldn’t be any external drives to cause problems.
But of course, students being students it is possible … more than possible I suppose!
So I opened the “faulty” project, set the scratch drives to documents as instructed and then looked at the sctach disc settings:

As can be seen the vieo and audo previews have been set by Premiere from “same as project” to the documents folder. I can’t see anything else to change there.
Looking in Preferences I find

The media cache files are being saved to the system drive, nothing to do with any media card.
Setting “save media cache next to originals where possible” makes no difference.
So I can’t see anything in the project which is looking for a media card. Am I missing something?
Derek
Media Technician, City College Norwich.
Running mostly Adobe CS6 and Logic Pro 9, also with legacy Avid and Final Cut Pro 7. Mostly Macs, buying new PCs.