Okay, so I found the problem. I deleted everything, except for the folders Levels, ModelsF. SoundsF, MusicF, TexturesF and VirtualTrees, because those had some new things that had no replacements. Still crashed. Then I moved those folder to a separate place and little by little, added them back in, to see which file is causing the problem. It was a file called zzzz.wld... This is a temporary file I used for mapping. It's the copy of the geometry of a Revolution deathmatch level called Gvide. I had some ideas around it, so I had this temporary file to keep that idea until I was going to use it. It was nothing but two World Base entities. Maybe, something about the geometry is a Revolution exclusive feature that's incompatible with vanilla?
Anyway, someone reported crashes with your grenade fix and I also had crashes when firing grenades (the editor was still working during this time), so I think I'm going to have to find a different solution.
Happy new year, by the way. You said that a few messages ago and I meant to say it back, but forgot.