Potential solution for you
My maps have been crashing recently when I try to load them, but not after making any notable changes that would be likely to cause problems.
I got the error below and had a hunch that "strchr" refers to a character in the string file (map.str), so I deleted the map.str file and now the map loads normally (and crashes if I put it back).
worldbuilder crash.png 399.53KB 10 downloads
Also the str file works fine in the game, so the trick is just to move the str file out of the game folder in order to edit it, and back in to play it.