Did mesh get broken?

[Mau Jaxa]

I'm in the process of building my sim, using a lot of mesh stuff, expensive well made stuff. A few days ago, we were having inventory issues, so I took a day off from building on my sim. Yesterday, I suddenly started having problems going through mesh items that never needed to be set to Phantom before. These are items that were built specifically to go thru. I've tried unlinking all pieces and changing individual pieces to Prim, None or Convex Hull and it doesn't work. the ONLY thing that works is setting them to Phantom which doesn't work with all aspects of my build. I have done a work around by deleting some pieces and replacing them with something else, but now I have a cavern that is all one piece that I can NOT work around. This is a core part of my environment. What is going on with mesh all of the sudden?