Guild Bank Withdraw, Items "disappear"
I’ve had that happen before. I log out and back in and usually the item reappears.
It’s an issue with synchronization between two different servers, the one that keeps track of your account and the the one that keeps track of your guild back. If there’s enough latency, the item will sometimes be hidden, even though it occupies a slot in your inventory. As you noticed, moving another item forces a resync, which makes the first item re-appear.
The root cause has got to be incredibly difficult to identify or to fix (or maybe just resource-intensive). I prefer to live with the bug rather than have ANet staff worry about trying to resolve this (assuming I’m correct about the cost/difficulty).
John Smith: “you should kill monsters, because killing monsters is awesome.”