I am currently only seeing this behavior only for options on T and XRX. I subscribe to options on about 50 symbols.

It began November 2nd and has continued since.

These are my selected update fields:

Last,Bid,Ask,Bid Size,Ask Size,Bid Market Center,Ask Market Center

And here are a couple examples of the unusual ticks, out of 52 total unusual ticks, from the last few days:

Q,T1122A30,0.37,C.38,0.40,C-3600,9,23,5,
Q,XRX1122A12.5,0.39,0.38,C.41,394,C-1000,9,23,

In the same time frame I have received no F messages, and 1 P message, with the bad data:

P,T1122M27,C,0.42,-0.06,-0.125,50,50,0.42,0.42,C.40,0.41,C-5300,475,,,0.,09:55:43t,11684,0.42,0.48,0.41,27.000,,,n,,,,,11/02/2010,,0.42,01/22/2011,,,-0.06,0.,,,,,0.,0,,,12,2,81,116,NYSEALT-BSE-CBOE-ISE-PSE-NMS-PHLX,,,,,1,,,,14099631,,,16,23,16,09:55:43,5-6-9-11-13-16-17-23,

Please advise.

I meant to include examples so that you could see that the C. and C- appear on either the bid or ask.

Q,T1122M29,1.07,C.94,0.98,C-2400,12,23,11,
Q,T1122M29,1.07,0.97,C.99,46,C-1200,11,23,

Josh, we haven't had reports of corrupted data in a very long time. In fact, every case we have investigated recently ended up being something in the client app causing the corruption.

However, just to make sure we have a clean and proper installation of the feed, I would recommend that you start by uninstalling the feed and redownload the most recent version. From your logins, it looks like you are using a fairly recent version (4.7.0.9) but I definately recommend that you install the latest (4.7.2.0) since it has a few other bugfixes.

Beyond that, I am going to need more information about how your app uses the feed so that I can see if I can duplicate this locally. If you can provide me with a copy of your app, that would be best but if you can't provide that, I will need a list of requests that your app makes to the feed and an idea of how it functions so I can simulate that locally.

You can send this information to developer support if you would prefer it not be posted on the public forums.

I won't be able to upgrade until the weekend, it can wait until after I do that.

My code has been pretty stable, though.

I didn't see it today.

Josh, we found a server side issue today that was causing these bad quotes. For the record, the letter C was simply being added to the beginning of the proper values.

This has been fixed and you should no longer receive these bad quotes.

Thank you for the quick fix.

With the sizes, I saw "C-" before the valid value, not just "C".

You are right. I was only thinking about the prices. It would have been possible that the sizes had an extra - occasionally as well.