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Not looking for an explanation, just saying that these things also happen: often enough I get filled at a better price than my limit order. 5 or 10 cents max.

Better have a look at what Euan Sinclair has to say about technical analysis. It's the 5th or 6th answer from the top. https://www.quora.com/How-does-technical-analysis-really-help

Marcas, apparently you don't get my point. I'm not saying I rely on them or expect P/L to match whatever predicted level. I don't even choose my initial trade based on Theta. What bothers me is why T+1 is the only one that's way out of whack and the following ones are not.

Yes, these are models and there are limitations, but when you look at these day steps you know something is broken in the model. I'm not looking for accuracy here, not even 10%, but to show next day P/L roughly 4 times smaller than Theta predicts is too much.

It's not only Theta and how it translates to P/L, but theta and its impact on P/L are somewhat more intuitive and easier to asses. The other Greeks are all over the place too when you compare various platforms. Back to P/L now: IB has a rudimentary tool that you can open before placing the...

I'm referring to the T+0 line being in error when advancing the date by one day. Unfortunately it's not alone. Just set up any trade and look at its greeks in TOS, IB and tastyworks. They are way different. No need to post screen shots, you can check it for yourselves. So I wonder how much...

Thanks for the note, but aren't these updates supposed to happen automatically? I would think so. I haven't specifically downloaded anything and when opening TWS it shows 981.3g version.

Here is proof that TOS had it correct in the past. This is a screen shot of a trade I was looking at back in Apr 2020. Theta = 229. Then here is the same trade with day steps in one day increment. In order to see the expiration as well, I increased the current date by one day, so the purple...

That may have an impact, but the fact is TOS didn't have this problem a while back. It was all fine at beginning of this year.

My issue is completely gone now, but since you still have it I'm not holding my breath. It may come back again.

I tried this: right at start I clicked on another symbol in my watchlist and thinkback came out of freeze. Then I chose SPX and thinkback worked fine. What makes it freeze is when you have SPX selected on any other tab and then you click on thinkback. All my tabs are linked so thinkback will...

Now on one of my computers it's frozen on thinkback / SPX right from start and there is no way to do anything. I may need to re-install it.

Starting last night whenever I try to use thinkback the whole application freezes. It keeps displaying "loading data" or something like that, but no option chains are loaded and nothing works anymore. Cannot even shut it down. I need to use CTRL+ALT+DEL and then shut it down from the task...

Thank you for the reply and additional explanations. I know the option risk calculator, but there's no need to simulate. I know the boxcar is a great trade. I tried it many times (the previous variants) and it worked most of the time. For me the problem is I still go to work every day (on the...

Dan, thank you for the best and most comprehensive one to date. However I don’t have any question or comment about the trade itself or the adjustments. It’s about this error we keep having on thinkorswim and how it impacts you. For months now the analyze tab seems to have a problem calculating...

It doesn't hurt them to say they will address it. This morning after posting those screen shots for Status1, I started a chat session and complained again (the 3rd time) about the P/L not listening to Theta when you advance from current date. He initially said that when the trading day already...

But there is more. Before closing TOS, I saved the initial one as a text file and it shows like this: And now I saved what it became after reopening and it looks like this: And even if I try to import the initial one, it comes as a 17 SEP AM.

And here it is again after closing and re-opening TOS. So it seems to be a bug at their end.

Here it is:

The problem is still there and here is a refresh: P/L is not shown correctly when advancing one day from current date. P/L should increase by the value of Theta after each day. It doesn't do that after one day, but if you continue it will obey the formula. Well I found proof that it was correct...