IB M1 historical data - last hour of each day corrupted?

When downloading M1 historical data for some assets, often the last hour of every day comes out as a constant value (which could jump to 1000 even when the price itself is like 52.3) instead of the price data.
Do other people encounter the same problem? Did I set a wrong parameter somewhere, or is this just how it is with IB? Any workarounds?

I would advise to download a trial version of MC, load the data you need and observe it there.
If you see the same sort of erroneous prices - then the problem is on IB's side (and you should alert them to fix), if not - it's with Zorro's IB plug-in.
My guestimate is that this is what IB's API streams.

Thanks for your suggestion!
Sorry for not knowing, but what does the abbreviation MC stand for?

Multicharts. Or any other platform with a quality/proven integration to IB.

Oh, multicharts looks very interesting. Does it do the same things zorro does? In your opinion, what are the main differences between the two?

http://zorro-project.com/faq.php#comparison

@easyX: Thanks for the link!

@Zheka: So, I got multichart trial version, started QuoteManager and set up a symbol to connect to IB. I can connect it successfully (IB Gateway says connection is established), but I can't seem to find a "Start historical data download" button in Quote manager... Any hint on how to do this?

MC works off charts. Add a chart, choose a symbol (and details) - and it will request data from the datasource. You can then visually inspect what has been downloaded.

MC does not do the same things as Zorro. But it does other things well.

If the symbol you are looking for is not pre-set in QM, you will have to add it manually (in QM). Spend some time reading the manual..

Hi Zheka, thanks for the suggestions! I did get a symbol in and set a chart up, but could not figure out how to move its timeframe further back into the past... Will have to look into it.

OK, it turned out that it was not the last hour being corrupted, but actually the time period where market data appeared every day in the file was inconsistent. So one cannot just cut out a fixed time frame each day from the downloaded data. See my new post for details.

In symbol details, choose a session template "24/5". Then you will see the full day, regardless of when it actually trades. This will then be comparable to what Zorro downloads.

Ok, but don't we actually want to see only the market hours anyway?

Yes, we want. But the concept of 'hard' Sessions is absent in Zorro...

@JCL,
is it possible to make StartMarket/EndMarket (with some flag) physically restrict:
1) sampling of the data in TEST/TRAIN/TRADE modes
2) data retrieval from the datasources/brokers..

Thank you.

Yes, a Weekend flag for this is on our list.

Yes - for both 1 and 2? This would be very helpful indeed.

A 'Weekend' flag doesn't seem an 'intuitive' placeholder for such functionality though...

For 1 only. For 2 you can use a simple script that removes unwanted data out of a dataset.