[ QUOTE ]
Rick he might not know the file name , could you on a Mac search the creation date of the files of that day.
[/ QUOTE ]
Not that I know of Guy...other than going into list view and sorting by date like in Windows.
Anyway I just had a chance to get to the Mac and I could not duplicate the situation of deleting files from the Process window but I sure found out that "delete immediately" clears out any selected thumbnails and corresponding images with no stop in the Trash bucket. It looks like the only solution may be one of those disk recovery tools. I notice there is one just listed on Version Tracker. Here is the link.
http://www.versiontracker.com/dyn/moreinfo/macosx/24747
Good luck!
Rick
p.s. You should also try the official C1 support forum...but you've probably already done this.