I will try the correct reference again but like I said, I ran it before I even started the program so it should have fixed any problems. Marque, This might not be the problem in your case, but when I ran correct reference the first few times it didn't work on every file, but the error message wasn't clear. I thought it was okay, but still got the lockup. I ended up going through each file idividually and discovered that a number of CR2 and HR2 files were set as 'read only' by the creators. Obviously, CorrectReference can't correct these. I changed the properties on the affected files, ran correct reference again and all was perfect.