I tried the latest build today and noticed a couple issues:
1. Upon first start of the new build 2856, the launcher asks me to fix my unchanged mod list for DOOM2. Luckily at this time DOOM2 is the only game I have configured to play with some mods. So I clear the DOOM2 mod list, re-add all unchanged mods, start a game, exit, quit the launcher, restart, guess what, I'm asked to fix the mod list again. It hasn't happened again after this yet, but still...
2. The title music in Heretic appears to be played to loud, despite having set the music volume in Heretic to ~40%. Due to the loudness the music sounds distorted.
3. Starting a new game in Heretic, the title music continues to play instead of the designated level music. Using the console command "stopmusic" stops playback of the title music, but after a restart of the map no music is played at all.
EDIT: Issue 2 and 3 appear to be related to a definition mod for "Colored Fog". See my next post below for the details.