I have a Samsung SH-S203N (firmware SB02) and I get this error when trying to burn data between 3.5 and 4 GB. I resolved the problem putting a high value in the "Image Minimum Size" option (build tab), like 2295100. This forces the program to fill the DVD with dummy sectors and gets rid of the finalize disk error.
It would be nice to be able to specify a different value for different type of media, so wouldn't be necessary to change the option when writing CDs or DVDRW.