Hey @Boruki !
In the editor, you can just save normally (eg using Ctrl S) and the voxel world will save. No need to manually click save nor load 
When you get a crash could you send a message on the discord or open an issue on github with the crash callstack? Can’t fix them otherwise
btw, I really recommend joining the discord if you haven’t already, I’m rarely checking the forums: https://discord.voxelplugin.com