I used the trial version of the software for the data collection ... could that be the problem???
No, that can't be the problem.
I have looked at expressions.miss coloumn, but there are only "0" and I'm sure the subject made some errors.
#1: You'll want to make sure you're really looking at the correct column (expressions.miss) by opening the data file in a spreadsheet application like Excel.
#2: You'll want to look at the last line of data for each subject which will contain the final value across all trials.