Hi Adub,
first of all thanks for the kind words and for using A2D. Let's approach the issues, as I believe they are not impossible to solve.
About save settings: do you mean Preferences? Are you sure you have saved them by checking the lower left option box? You can verify the preferences saving by looking at the following reg key:
HKLM\Software\AVStoDVD
About DTS-HD audio, I have to admit that I am not very used at BD to DVD encoding. Anyway, here you are some suggestions:
1. I'm sure you have already installed ffdshow as DTS audio decoder, haven't you?
2. Have you tried DTS to AC3 conversion with QUENC profile?
3. When you select the other AC3 sources, try do demux them instead of directly encoding using FFMpegSource
4. Use always the 'Preview Clip' function: it saves you time and if there are AviSynth errors, they are displayed.
Let me know
Bye
MrC