Tested the map in the editor (opened in editor -> testmap) or in bnet (sc2 -> host game etc.)?
If you only tried the editor you could disable preloading in the editor settings
You can either try encrypting your banks by modifying values while saving (like multiplying them by 985 + 497 or sth.) so while editing bank values won't mean much to the one editing, then decrypting them when loading map and returning fail if values don't match (failed 'hacking').
There's not really a better solution atm, blizz didn't think well about using banks for saving stuffs like that.
May only work vs. hacking not vs. duplication.
You could try to attach a value to every item that contains the name of the player who found/bought the item and a number. The numbers increase with every item found by the player (e.g. first item found is 1, second 2 etc.). Every number should only used once per player! (store the last number used in the bank)
Then you encrypt this item-identifier and attach it to the item. This identifier does not change when an item is traded! After loading the heroes you have to check all items. When there are two items with the same identifier do <random action>
However this only works for items not for money and additionally only when two players with duplicated items join the same game (friends will play together ;) )
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@AmelieCL: Go
Tested the map in the editor (opened in editor -> testmap) or in bnet (sc2 -> host game etc.)? If you only tried the editor you could disable preloading in the editor settings
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You could try to check whether your unit is a valid target for a unit that can only target air units.
/edit: -.- no actor event
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May only work vs. hacking not vs. duplication.
You could try to attach a value to every item that contains the name of the player who found/bought the item and a number. The numbers increase with every item found by the player (e.g. first item found is 1, second 2 etc.). Every number should only used once per player! (store the last number used in the bank) Then you encrypt this item-identifier and attach it to the item. This identifier does not change when an item is traded! After loading the heroes you have to check all items. When there are two items with the same identifier do <random action> However this only works for items not for money and additionally only when two players with duplicated items join the same game (friends will play together ;) )