Trade failed, cannot reopen trade

[Malong]

I don't know if this is consistently reproducible, but here are the circumstances:

* 11112 sends trade request to 2516978
* 2516978 opens trade, adds items, clicks accept
* 11112 adds item, clicks accept
** checkbox for 2616978 gets unchecked
* 2516978 clicks accept
* nothing gets traded, all items are still in respective characters' inventories
* 11112 sends trade request to 2516978
** Message displays "You already have a trade open with that character!"
** No trades are displayed under Active Trades

[wowcraft]

I've also experienced this bug and can no longer trade with several of my house members because of it.

[Malong]

I've also experienced this bug and can no longer trade with several of my house members because of it.

Well I just traded with a different character, but there's a corner case where both players only have one character and can't spare the 500 gold for the invite.

[Kip]

This has happened before but I have still been unable to duplicate the error - even by following those steps.  There must be some other variable I have not thought of yet.  If you can make this error occur reliably, please let me know.

I've reset all the broken trades to be open.