I didn't write down the error I get for Armiger's Stronghold in Molag Mar's Waistworks but it has to be the same as the one I just got for Redoran's Vault because it leads to the same texture glitch in both cases.

It appears to be a yellow-green triangle that goes from the first floor to the second floor. In both cases it appears to be where a table should be located.

The error is:

"Model Load Error: is not a NIF file in Meshes/f/furn_de_table_03.nif"

I have Morrowind, Tribunal, and Bloodmoon installed with MGSO and ME as the only mods installed.