Okay, here we go: 1) During the game, when did the problem begin to occur?
Just after returning from Korriban, having witnessed the recording of Vash and her Padawan and ascertaining the coordinates from T3-M4.
2) Did you install the latest version of the mod? (1.8.4 and 1.2 respectively)
I believe it's 1.8.3 for TSLRCM, but that shouldn't matter since it worked just fine the last time.
3) What version of the game do you have? (Steam, GOG, 4CD, KotOR Collection?) What region is the game designed for if it's the 4 CD version?
GOG.
4) Did you update your game as required by your game's region? (4-CD version ONLY)
N/A (GOG version).
5) Did you install this over the previous version(s), or did you perform a fresh installation as required by the TSLRCM's read-me file?
Fresh. I've never installed TSLRCM or M4-78 before.
6) What other mods have you installed? Please give an accurate list and provide links to each of these mods - even if they are found on this site. (We don't actually know them all!.)
Oh, geez. Too many to name, too many to track the links for (some of which may be dead). Suffice it to say that the only additional mod I've installed since the last time I played (when it worked fine) is the mod that reskins all the HK droids to resemble their TOR counterparts.
7) Can you be more specific about the error? At what point did it happen?
See the answer to question #1.
8) Have you tried re-downloading/re-installing the mod?
I could, but it would involve uninstalling and reinstalling all of my mods which I installed on top of TSLRCM and M4-78, many of which involved lots of file tinkering and manipulation. I believe it's moot anyway since, as I said, it worked fine the last time I played.
9) Have you tried using a different save game?
Yes. I have a save from just before talking to T3-M4. Same results.
10) Have you tried starting a new game?
Such a thing would require too much backtracking, and I have hardly any time to play the game as it it. Thusly, it took forever to reach this point. I can't play it all day long and be done with it in less than a week like I could a decade ago.
11) What Operating System do you use? (List Virtual Machines as well if you are using them.)
I'm still an XP user, for now. Working on building a new computer (which is beside the point, but there you go).
12) Can you confirm that you see the TSLRCM logo on the the main menu screen?
It isn't there anymore only because I installed a module reskin mod that included a reskin of the main logo (which I didn't care for and deleted). That is the only reason why the Restoration Project logo no longer appears.