dat writes do not stay written

Change a units.dat or weapons.dat value with EUD and it appears to work, then at some point it is back to the stock value. Before you go hunting for the bug: this is normal. The game re-reads and refills these tables from several paths, so a single write is not guaranteed to survive.

The fix is simple and boring: write it again every cycle. With hyper triggers running that is more than twenty rewrites a second, so whatever puts the stock value back is overwritten on the next pass.

function applyWeapon(w, dmg, cd) {
    // 매 사이클 다시 쏀니다 / rewritten every cycle
    Weapon(w).damage   = dmg;
    Weapon(w).cooldown = cd;
}

This is not a performance concern. A dat write is a single memory write, and dozens of them every cycle do not add measurable load. What the saving does buy you is a bug that is hard to reproduce.

The converse also holds: some things only need writing once. Data you put in memory the game does not refill - button records, for instance - is written once, and only the pointer to it is restated every cycle. Rewriting the records every cycle is what tears the display, because the content changes under the cursor.