To clarify: the R:TW engine has a number of issues that are don't arise or are negligible for the vanilla game, but become problematic when you attempt to max the possibilities of the engine. The memory-loss is one of these: on a powerful computer you won't even notice it when playing vanilla, but EB's huge data files seem to result in crashes if the game is played for a long time.
There are a number of unsorted issues with EB, but because most crash bugs aren't replicable* the problem does cannot lie in bad data-files. These stay the same. Presumably, the problem lies in the fact that the datafiles interact in ways that weren't attempted by the original developers, and this causes unforeseen problems in the core engine. In other words: EB's file do what they should. It's the engine that is causing problems, and because the crashes aren't replicable we cannot even guess at the causes.
(* the campaign to/from battle bugs aren't replicable in the sense that you can fight the same battle on the same location a few turns later without consequences.)
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