"There have been two reports recently that Zorro could not close trades with the MT4 bridge under certain circumstances"

What are the circumstances?

I have updated zorro.mq4 (compiled to zorro.ex4) and although Zorro is now closing trades on my own strategy, it is still printing:
On Zorro => "Can't close"
On MT4 Bridge => "Close failed - Invalid function parameter value", "Invalid lots number or OrderClose funtion"