Buy more memory?
If you are editing large fonts, FontForge may run out of memory. All too often when FF runs out of memory, the kernel will crash rather than report an error condition. FontForge does check for failure to allocate and attempts to free up some chunks of memory when the system returns an error — I’ve never seen this code activated though. FontForge does provide a mechanism which might help you avoid this. FontForge generally wastes a lot of memory keeping undoes around. You can clear undoes associated with a glyph with the Edit->Remove Undoes command. You can also limit the number of undoes that will be stored with each glyph with the File->Preferences->Editing->UndoDepth.
