Same 😛
There was some hubbub about some maps crashing, I got a bit fed up and dug up the code to figure it out. With 15 more years of experience coding in general, it was much easier to find the issue. I also found some old threads on here that were clearly the exact same bug, posted in 2010.
I had started a side project of a new editor in C++, too. It was mostly a playground to play with simple OpenGL rendering with simple shaders. You can check it out at https://github.com/samapico/scme. So far it's able to open maps, display the tiles, move the camera, zoom, and edit tiles on the map with a simple pencil-like tool. Can't save yet.
Honnestly, converting it to VB.NET probably wouldn't help it much, it's pretty spaghettified at this point...