Skb, I am having the same problem with TT Home & Business desktop software. I am running Windows 10.
I have multiple broker statements with a large number of transactions. Have done all the troubleshooting.
I can't find an answer here on the blog. Everything was fine until I went to enter my 6th or 7th broker (can't remember how many now but it was my last statement).
I am hoping this will get resolved soon as it is March 16th :(