Wall Worm has continued to see updates. I just haven't updated the changelog as often as in past. I now work at Autodesk on 3ds Max itself, so my priorities have shifted. I'm still updating WW, but it is no longer my primary focus.
As for the maps that crash... are these raw VMF files or are they decompiled VMFs? Which maps?
As for the maps that crash... are these raw VMF files or are they decompiled VMFs? Which maps?