This is somewhat of a repost from http://www.mmowned.com/forums/world-...creenshot.html but it seems with the patch this exploit has reappeared for some reason. I haven't tested it extensively, but by simply joining a random dungeon and repeatedly teleporting in and out of the dungeon it resets the withdrawals after each teleportation. Of course, there are probably other ways of doing this and it may rely on your guild rank, but this is just a simple explanation.
Screenshot of my guild bank in ZG
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Screenshot of my guild bank after teleporting out of ZG
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Edit: Before anyone asks it, this is not just a client side bug, you can actually take out the items if you want. Also, as said below, this had nothing to do with the clock, was just a coincidence. I tested it at a few times about 5-10 minutes before and the same results occurred.