I always use ConvertXtoDVD,it has no any problems:
It supports most video and audio formats for video conversion (avi, mpg, mov, wmv, mkv, ogm and more),You also can create DVD Menu and add subtitles(SRT, .SUB/IDX, .SSA) to DVD. It can create NTSC DVD and PAL DVD with high quality.
Free download from vso official site:
http://www.mkvconverter.com/convertxtodvd/
Hope it is helpful for you.