Thanks for the quick reply. If I understand you correctly, then this means I entered my client's 1099B incorrectly. (The numbers are actually higher, but I kept the relative math the same on my fictitious numbers.)
Continuing with my fictitious numbers, here's what 2017 looked like:
Box 8 = ($1,200)
Box 9 = $0
Box 10 = $1,234
Box 11 = $34
And to recap, here is 2018:
Box 8 = $0
Box 9 = $1,234
Box 10 = $0
Box 11 = ($1,234)

In my original post, I stated that I selected "2=straddles". This was a mistake. It was late, and I intended to review it this morning.

So, what to do with box 11? It seems as though you're saying that boxes 8, 9, & 10 are all summarized into box 11, which is the only thing I need to enter into "section 1256 contracts gain (loss)", and leave all other cells in Lacerte blank (except for choosing 1=1256 contracts).

Am I now reading this 1099B correctly?

We don't see a lot of clients with futures & options trading, but we are starting to see more of them, so I need to get a handle on this.

Thanks for your help!