The only mod that I installed that modifies pcdead2.dlg was the Extended Enclave mod. I am using 1.8.6 RCM.
I have two pcdead2.dlgs here. The "original" is the the backup made from this mod's TSLPatcher.
The second, the "old" is the one that this mod's patcher made.
The third is the modified one I made to fix this issue.original pcdead2.dlgold pcdead2.dlgpcdead2.dlg
Edit: I just tried installing it again a separate install.
TSLRCM 1.8.6. + M4-78 1.5
Then Extended Enclave 2.52 (standalone then M4-78 as per installation instructions).
Then this mod. Reproduces this problem.
The latest version includes some files which were left out of the installation instructions for the Korriban add-on. If you already have the mod installed, you can apply the same fix by copying the following files manually from the tslpatchdata folder to your game's override folder:
g_a_clothes38.uti
ia_cloths_038.tga
N_SithComF38.tga
N_SithComM38.tga
This mod is for the first KotOR game, so you're not supposed to install this mod in KotOR 2 anyway. Not to mention, the Steam version of KotOR 2 already supports widescreen by default, so a high resolution menu mod is unnecessary for KotOR 2.