As the title says, I can't save the heightmap. Rather, I can ,but when I try to save the changes into the plugin, the program freezes for a minute tehn crashes, undoing all my work. I could really use some help with this very annoying and mod-murdering (literally murdering) problem.

Me and a friend are trying to create Atmora, which is about as large as Skyrim, when measured by the actual country. Thing is, we've tried to build Atmora a few times now, one in an ESM by editing it with an ESP, which only glitches it out and turns everything into disfigured cubes.

Our current, bug-free (formerly) idea is to build everything in an ESP, and it seemed to work when I flattened the entire editable heightmap so the CK and game would actually load the cells of the Atmora worldspace. But now that I pretty much gave all of Atmora a decent shape, the CK refused to save the plugin and exited instead, and I've now lost DAYS of work.

The wotld needs to be 128x128, which is pretty much the size of Skyrim's worldspace, but I guess that is too much for an ESP, but an ESM isn't going to work either as it only gets corrupted.

What should I do? Quit on a mod that is 5 years in the making?