OK, I found the form view function. My responses:
A. Yes, form 1040 line 18 has a positive value.
B. On form 1116, the amount on line 14 is zero, despite the amounts in line 11 and 12 being positive (and identical), and line 13 being zero. This appears to be the bug. Essentially it's reducing all of my foreign tax paid to zero. I entered no data that would account for that.
C. Line 19 is indeed greater than zero. There are indeed positive amounts on lines 21 and 23.
