Alright, step by step, the working dupe:
1) Drop 1 adena piece, over and over, until the game lags up and you can't drop any more pieces -- Immediately LOG OFF your character.
2) Your character selection screen will be empty -- log into your character using the top left menu.
3) You will see the character selection screen options when you log in, still on your screen.
4) Create a shop and sell stackable items, i.e. varnish, steel, any thing.
5) Log on to your same character using the options mentioned in #3.
6) Game crashes, cntl alt del out.
7) Load the game again, log into your char, you will be on top of your clone. Purchase the items from your clone then restart, relogging into your character.

Duped!