I'm trying to merge two files together, which both include .srt files. When I select merge and add the second set of files nothing happens. All 4 files appear in the dropdown list, but the longer time length does not register, and when I attempted to burn a DVD only the first part was on there. The files burn fine separately, so I don't understand why they won't merge successfully. Everything worked okay when I tested the merge function using a different set of files.

Any insight is much appreciated.