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Cannot save changes to events or projects
I’m working from my MBP for the remainder of the week with a 1TB external media drive attached.
I created a new transition in Motion and published it to FCPX. When I CMD+Tab to FCPX I get this dialogue:

All my media is on my external scratch drive which has more space than I can think of, at the moment! All the events and projects are on this drive also. Doing a CMD+I I’m being informed that there is more than 600gigs of free space on the drive.
This is the second time this sort of thing has happened in the last couple of days. I’m wondering if there is possibly a conflict between FCPX 10.0.6 and Motion 5.0.5?
Can anyone please suggest how a) this could be happening and b) how it can be resolved other than quitting and starting FCPX and Motion and the whole shooting match, again?
Flustered but willing to learn,
Lawrence