Yes Gster I have had something similar happen with the Nexus platform on option trading. In fact, if you trade long enough, you will see everything happen.
I have had trades reversed because the market maker "hit the wrong button". (To date, none of my hitting the wrong button orders have been fixed. ) I have seen stop loss orders similar to 37 shares sold leaving 63 held when the price never even came within 2 dollars of triggering the stop loss order which had been in for 3 weeks.
When I phoned it in, they of course said I had made an error. Later on for three days there phone service sucked as they corrected thousands of these types of orders.
In every case, the first response was - well you must have typed something in wrong. Never has anyone assumed that the order execution side made an error even though I have shown that to be the case sometimes. (Most times it has been my own error, but those are easier to accept for me.)
Now, whenever I see something wrong, I take a screen shot of it. Even submitting that screen shot, I have heard all sorts of excuses.
I use hibernate a lot on my laptop with the Nexus platform. Nexus will come back up when you type the password but the connections are not working properly. Orders will not fill. Quote prices are wrong. You must restart it every time to be sure it is working. When I proved this to the help desk, they told me that this is how it is supposed to work. I told them that in my view they will one day face a huge lawsuit over this kind of sloppy programing.
The incident similar to yours was when I was trying to get the best fill profit on a large option position. I would type the price in, click on the buy and look at the checking message. The price was reset, the price I entered in the stock box was reset. I did it 3 times slowly and the behavior was the always same. Usually I don't set such precise orders so I happened to see it happening.
I was told that there was a flag in the Nexus platform settings that did this and sure enough when I unchecked it, the behavior stopped. No one could explain how the flag suddenly got changed though. Of course it was my fault, even though I didn't know where it was or even what it was for.
Possibly, during the upgrade, that flag was reset.
Sorry to say that it is rare to win these issues even if you are in the right. I now chock it up to an extra cost of trading and don't sweat it to much. I have been know to immediate reverse and rebuy or resell the position when I have made an error. Sometimes I take the rest of the day off since it shows that I am not sharp.
Sorry to hear about your experience.
