I'm not sure if some radios may actually start at memory zero. The
comment about deleting row zero would seem to indicate that is not the case.
Many radios start at zero (including your 7100), and also there should *always* be a row zero regardless of the origin of the memory bounds of the radio. My guess would be that we failed to load _your_ memory zero due to a bug in the driver, that row is marked as an error, and thus the export is failing to be able to capture it. All of that will be more obvious with your debug log and full report based on the instructions above and I'll be happy to dive in.
The driver init for the 7100 tells Chirp that its memories start at 0, as does the init for the 7000. All of the other radios in that driver tell Chirp they start at 1. When I wrote the code for the 910, I remember initially using the 7100 code as a reference, but being puzzled as to why it started at 0, when the manual says the memories are numbered 1-99. I initially followed suit, but starting at 0 did not work for the 910, which also numbers its memories from 1-99. I don't have a 7100, so I couldn't test, but just wanted to mention that here in case that code really should be starting at 1 instead of 0.
Martin. KD6YAM