I currently run Z5 on my demo mt4. Recently Zorro place a long stop order at 1.2211. When the price hit 1.2211, Zorro print a message says can't open.below are part of the trade messages:
[Mon 12.05. 12:00] 4898 +0 +0 '
(EUR/CHF::L) Long 5@1.2211 Entry stop
(EUR/CHF::L) Entry stop 1.2211 hit at 12:17
(EUR/CHF::L) 12:17 Can't open 5@1.2211

I search through the manual to find that this case happens normally because currently no price quote is available. But Zorro on my computer operate within the business hours, so probably price quote is not the problem. If you already know why, feel free to tell me.