Ok, let's give a try to this one (BatchMux v1.4.1, hotfix, beta):
http://www93.zippyshare.com/v/8ZFyL4Lq/file.html
Once you download it, it is intended as a direct replacement for the version 1.4 of BatchMux.exe, located in the AVS2DVD programs folder.
In case issues are still present with this version, please let me know...