I used to have the exact same problem you're encountering when I switched to MO, so I know how you're feeling. It used to drive me batty. Somewhere in the past year or two I managed to get it working properly, but my problem here is that I don't recall exactly what fixed it, so I can't tell you *this thing* is what you're missing. I think it will come down to one of two things though:
First, where do you have MO and Skyrim installed? When I used NMM, I had Skyrim (and Steam) in C:\Program Files\, which was the default for Steam's installer. I found that this does not work well with MO because Windows' permissions system does a lot to protect that folder. This creates problems with BodySlide, and also other programs like FNIS, when it tries to write files. Moving Steam to C:\Games\Steam\ solved a lot of issues there. Likewise, I have MO in C:\Games\Mod Organizer\ to avoid permissions issues. I don't know if the permissions problems might also impact reading the texture files inside BodySlide. So this might not be your solution.
Second, just to confirm for the sake of not overlooking the obvious: are you using the latest version of BodySlide? As opposed to, say, using an older version you already had to avoid downloading it again. At one point, I honestly thought the texture problem might have been a bug in an older version of the program that had been fixed.
Edited by DarkRudra, 20 January 2018 - 07:03 AM.