Several times, on two different computers, the latest version of IB's TWS --I use "Classic" version -- starts by opening about 25 blank Book Traders. I had left a message with IB few days ago, but no response, so posting here. To fix the problem, when starting IB, go to "more options," and select "Stable" rather than "Latest" version.
The title is written in such a way that it appears to be GOOD NEWS. It seems like you are rather pleased with the solution (using a Stable program).
I only use the Offline TWS. I decide when to update and can roll back if there's an issue. I keep all the previous versions.
I do not know, if it is any help But, in the TradersAcademy *Advanced* *TWS Advanced Trading Tools* video it is said *Number of deep book data panels depends on the number of allowed market data lines* in Book Trader.
The video also says it depends on comisions * So, if you trade alot you got some data for free and vis versa. Hope it helps